Unknown error on iPad when running web study

AKrishna — Thu, 27 Aug 2026 15:07:24 GMT

Another new one for me - I recently set up a web study (https://mili2nd.eu/rzmc) and tested it on my Windows 11 laptop, where it worked fine. However, another user later tested it using an 11'' 2nd Gen iPad Pro (OS/X 18.6.2) and had a strange issue where the first script in the batch ran normally, but Inquisit then quit, showing a "The study encountered errors - the researcher has been notified" screen, but no error code. The logs show no errors, simply a lack of data files for the remaining scripts which didn't run. Any ideas?

The iPad model number is MY252FD/A, if that helps!

RE: Unknown error on iPad when running web study

Dave — Thu, 27 Aug 2026 15:07:24 GMT

Excellent -- thanks for letting me know!

RE: Unknown error on iPad when running web study

AKrishna — Thu, 27 Aug 2026 14:55:19 GMT

It looks like your wild guess was on the money. I re-encoded the videos as you suggested and now the iPad is running the experiment. Just for completeness, here's a local log of one failed runthrough on the iPad from before the new videos were uploaded:

[code]2026-08-27T05:38:01.215    InquisitPlayer    6.6.3    6611    InquisitPlayer    Data Manager    Stop Uploads    Pending Data=0
2026-08-27T05:38:01.218    InquisitPlayer    6.6.3    6611    InquisitPlayer    Start Test Online    Script='prodi_all_test'    Account=4351    ScriptPath=https://scripts.millisecond.eu/elkehoffmann/prodi_all_test/klasse 3 und 4 alle subtests.iqx    HomeServer=eu.mili2nd.net    DataUrl=''    FinishPage=https://eu.mili2nd.net/inquisit6/finish    Monkey=human    SessionId=1    GroupId=67    SubjectId=m_dlhkn0u1qhk9
2026-08-27T05:38:01.934    InquisitPlayer    6.6.3    6611    accountId='4351'    License Check Successfull.
2026-08-27T05:38:01.934    InquisitPlayer    6.6.3    6611    InquisitPlayer    License Check    Result=1    AccountId=4351    ExperimentId=78641    ExperimentName=prodi_all_test    ScriptName=78641    Offline=0    isCached=1    ScriptUrl=https://scripts.millisecond.eu/elkehoffmann/prodi_all_test/klasse 3 und 4 alle subtests.iqx
2026-08-27T05:38:02.022    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/klasse 3 und 4 alle subtests.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Graphics=QtOpenGL    ColorDepth=24    ScreenWidth=1194    ScreenHeight=809    RefreshRate=120    VidoeSync=WaitForVerticalBlank
2026-08-27T05:38:02.022    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/klasse 3 und 4 alle subtests.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Graphics    isTablet=0    isScrollable=0    hasResponseView=0
2026-08-27T05:38:02.247    InquisitPlayer    6.6.3    6611    InquisitPlayer    NotifyTracker    Success    Script='prodi_all_test'    Account=4351    ScriptPath=https://scripts.millisecond.eu/elkehoffmann/prodi_all_test/klasse 3 und 4 alle subtests.iqx    HomeServer=eu.mili2nd.net    DataUrl=''    FinishPage=https://eu.mili2nd.net/inquisit6/finish    Monkey=human    SessionId=1    GroupId=67    SubjectId=m_dlhkn0u1qhk9
2026-08-27T05:38:02.247    InquisitPlayer    6.6.3    6611    Network    Requests Remaining=0    Completed all pending requests.
2026-08-27T05:38:02.252    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/klasse 3 und 4 alle subtests.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Script starting...    Cached=0    isOffline=0    isNetworkReachable=1
2026-08-27T05:38:02.560    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Script starting...    Cached=0    isOffline=0    isNetworkReachable=1
2026-08-27T05:38:04.256    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Opened Temporary DataFile='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Application Support/Millisecond Software/Inquisit Player/pending/files/raw_anfang_stopp_raw_m_dlhkn0u1qhk9_2026-08-27-12-38-02-277.iqdat'. Found FileSize=0 bytes.
2026-08-27T05:38:04.260    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Script finishing...    Cached=0    isOffline=0    isNetworkReachable=1    hasData=1
2026-08-27T05:38:04.274    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Closed Temporary DataFile='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Application Support/Millisecond Software/Inquisit Player/pending/files/raw_anfang_stopp_raw_m_dlhkn0u1qhk9_2026-08-27-12-38-02-277.iqdat'. Found FileSize=299 bytes
2026-08-27T05:38:04.275    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    ResultsManager    storeData    Write HTTP Scheduling Upload of raw_anfang_stopp_raw_m_dlhkn0u1qhk9_2026-08-27-12-38-02-277.iqdat
2026-08-27T05:38:04.275    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    PostHttpData    Write HTTP Scheduling Upload of anfang_stopp_raw_m_dlhkn0u1qhk9_2026-08-27-12-38-02-277
2026-08-27T05:38:05.588    InquisitPlayer    6.6.3    6611    Script='/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/Library/Caches/Millisecond Software/Inquisit Player/scripts/78641_100495664d383cb8183298121523decd/anfang_stopp.iqx'    GroupID=67    SubjectID=m_dlhkn0u1qhk9    Script completed successfully.
2026-08-27T05:38:06.306    InquisitPlayer    6.6.3    6611    InquisitPlayer    DataUploads    Starting Upload
2026-08-27T05:38:06.306    InquisitPlayer    6.6.3    6611    InquisitPlayer    Data Manager    Start Uploads    Pending Data=0    Visible=0
2026-08-27T05:38:06.306    InquisitPlayer    6.6.3    6611    InquisitPlayer    Finished Test    Failed    Script='prodi_all_test'    Account=4351    ScriptPath=https://scripts.millisecond.eu/elkehoffmann/prodi_all_test/klasse 3 und 4 alle subtests.iqx    HomeServer=eu.mili2nd.net    DataUrl=''    FinishPage=https://eu.mili2nd.net/inquisit6/finish    Monkey=human    SessionId=1    GroupId=67    SubjectId=m_dlhkn0u1qhk9    RuntimeMessageCount=13
2026-08-27T05:38:06.307    InquisitPlayer    6.6.3    6611    InquisitPlayer    Data Manager    Stopping Uploads    NetworkReachable=1    Pending Data=0
2026-08-27T05:38:08.085    InquisitPlayer    6.6.3    6611    Open Web Page Local    URL=file:///private/var/mobile/Containers/Data/Application/A74B59CA-A848-49FD-8D74-A018D85DA984/tmp/InquisitPlayer/Errors.htm[/code]

Thanks for your help as always!

RE: Unknown error on iPad when running web study

Dave — Thu, 27 Aug 2026 11:41:44 GMT

+x[quote]

[b]AKrishna - 8/27/2026[/b]
Another new one for me - I recently set up a web study (https://mili2nd.eu/rzmc) and tested it on my Windows 11 laptop, where it worked fine. However, another user later tested it using an 11'' 2nd Gen iPad Pro (OS/X 18.6.2) and had a strange issue where the first script in the batch ran normally, but Inquisit then quit, showing a "The study encountered errors - the researcher has been notified" screen, but no error code. The logs show no errors, simply a lack of data files for the remaining scripts which didn't run. Any ideas?

The iPad model number is MY252FD/A, if that helps!
[/quote]

Have you checked the app log on the iPad? Tests tab in the Inquisit Player app, tap Log in the upper right corner.

Wild guess, just looking at the files: MPEG is ancient as a codec. I would encode the videos with a modern codec (H.264 in a MP4 container).

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Unknown error on iPad when running web study

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RE: Unknown error on iPad when running web study