strange ".bmp" screen between trials

[motomibo]

Hello,

We're showing video stimuli followed immediately by instructions for a lexical decision. As soon as the video ends, there's a brief flash of blank screen showing ".bmp" in small letters before the next screen. It's hard to notice because it's so fast, but participants might notice it after a few trials. Any clue what that's about?

Thanks

[jarvis24]

That usually means DirectRT is displaying the name of an image file that is being requested in the input file but is not located in the stim folder. Is that a possibility in your case?