White Screen Flash (During Runtime)

[Nick]

Dear All,

I'm hoping to receive some guidance on a strange bug in my E-Prime task. 

Here's a brief description of the program:

1. An arrowhead version of the flanker task that consists of 4 different 
stimuli (<<<<<, >>>>>, <<><<, >><>>).
2. The flanker stimuli are presented in white text against a black 
background. 
3. There are 3 test blocks that each contain 400 trials and the participant 
responds using the SRBox. 
4. The task is administered while EEG is continuously recorded.
5. Each test block lasts for 20 minutes. The total task takes 60 minutes.

Here's a brief description of the problem(s):

1. Each time I run the task, there is one isolated instance where the 
screen briefly turns white for no more than 300ms. 

2. The program continues to run after this occurs and the script always 
terminates successfully. 

3. There is no pattern as to when this occurs (e.g., could be 5 minutes in 
to the task or 15 minutes) and does not appear to be specific to a certain 
trial # or test block.

Miscellaneous Troubleshooting:

1. I've checked the power settings on the CRT monitor that is used to 
present the stimuli. The hard drive and monitor have been set to never go 
on standby or go to sleep.
2. The script always compiles without any errors.
3. There are no unreferenced E-objects.
4. Participants do not have access to the keyboard that is used to execute 
the task (I viewed several threads (and the PST website) commenting on how 
this could be triggered by the windows start button on the keyboard)).
5. I initially thought this could represent a run-time error, but it seems 
strange to me that it would self-correct and resume.


Any thoughts/comments would be much appreciated.

-Nick


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