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Another piece of information that might be useful: I just tried my own experiment and tried to touch the screen during trials that don't require any input (i.e., have a timeout instead), and the same crash occurred. Basically, whenever I touch the screen, it crashes.

Here's more from the crash log:

2016-07-28T18:00:53.798   InquisitLab   5.0.4.0   3732   Script='C:/Users/XXXX/Desktop/Experiment/InGroupOutGroupExperiment.iqx'   GroupID=1   SubjectID=1   Graphics=Direct2D   ColorDepth=32   ScreenWidth=1280   ScreenHeight=800   RefreshRate=60   VidoeSync=DXGIWaitForVBlankMode

2016-07-28T18:00:53.798   InquisitLab   5.0.4.0   3732   Script='C:/Users/XXXXX/Desktop/Experiment/InGroupOutGroupExperiment.iqx'   GroupID=1   SubjectID=1   Graphics   isTablet=1   isScrollable=0   hasResponseView=0

2016-07-28T18:00:54.516   InquisitLab   5.0.4.0   3732   Script='C:/Users/Nadia/Desktop/Experiment/InGroupOutGroupExperiment.iqx'   GroupID=1   SubjectID=1   Script starting...

2016-07-28T18:00:54.700   InquisitLab   5.0.4.0   3732   Script='C:/Users/Nadia/Desktop/Experiment/InGroupOutGroupExperiment.iqx'   GroupID=1   SubjectID=1   Opened DataFile='C:/Users/XXXX/Desktop/Experiment/InGroupOutGroupExperiment_raw.iqdat'. Found FileSize=2057 bytes.

2016-07-28T18:00:54.700   InquisitLab   5.0.4.0   3732   Script='C:/Users/XXXX/Desktop/Experiment/InGroupOutGroupExperiment.iqx'   GroupID=1   SubjectID=1   Closed DataFile='C:/Users/XXXX/Desktop/Experiment/InGroupOutGroupExperiment_raw.iqdat'. Final FileSize=2057 bytes.

2016-07-28T18:03:20.656   InquisitLab   5.0.4.0   3732   32bit   Release   CompileDate='Jul 5 2016'   CompileTime='16:50:48'   Initializing...

2016-07-28T18:03:20.673   InquisitLab   5.0.4.0   3732   System Platform='Windows NT 10.0; Win32; Touch'   MemAvail=269536   MemTotal=2034620   CPUSpeed=1333   TimerResolution=0.0007680001966080503   IPAddress=XXXXX2   MacAddress=XXXX

That's extremely weird. Just to clarify for me:

The test script in my previous response works for you, i.e., accepts touch input & doesn't crash, but for some reasons the other scripts do not. Correct?

Correct

Also, for what it's worth - I did just run it on my iPad by mirroring my computer screen onto the iPad and it worked using either mouse or touchscreen input. So, I'm inclined to believe that this may be specific to the ACER or Windows touchscreens

Thanks for the confirmation and the additional (very useful!) observations. Given that I'm not aware of similar reports involving other WIndows touch devices / touch screens (so far, that is), I'm inclined to think this *may* be specific to the Acer / its specific configuration. I'm not sure how to narrow this down further at the moment, but I'll log a bug report and update this thread if I can think of anything else. One thing I mentioned earlier was trying to check if there's an updated driver for the Acer's touchscreen available. Have you checked if Acer has provided any driver updates for your device on their site?

Hi Dave,
Sure - I'm doing a complete factory reset on the ACER and downloading all the latest drivers and software now. I'll give you an update to let you know how it behaves after that.

Sorry- it still hast he same issue after a full factory reset and downloading all of the latest drivers.

Thanks for trying the driver update angle and reporting back. I'm out of ideas right now, but we'll investigate, see if we can reproduce this somehow and ultimately figure out where exactly the problem stems from.

Thanks again for sharing your helpful observations and test results.

  Hi Dave,
I have the same problem in an Acer Iconia W4 tablet   with a Windows 8.1. As soon as I run the script on Inquisit 5 and I touched the screen it crashed. I have tried with Inquisit 4 and it works Ok, but I only have licenses available for Inquisit 5. I would appreciate any help.

Best