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Online experiment grey screen when using routine with image and excel file

URL of experiment:

Description of the problem:

Further to this issue:

I have rebuilt a sample experiment to try to find out what my issue may be. When I remove the condition file the experiment does run as expected. The condition file contains two parameters: Test_duration and Reference_duration.

When I add my condition file, the auditory component of the experiment works fine with the condition file (using the ‘Reference_duration’ parameter) but the image component does not for some reason. I am left with a grey screen once the experiment gets to the ‘test’ routine. For both of these I set the stop time in duration(s) and use their respective variable ($). I have tried using FrameN and duration(frames), changing the values accordingly in the excel file, but this does not help.

Is this a bug? Is there a fix to this issue that I am missing?

Any help is appreciated.