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Images do not show up

I have build a Navon experiment (with Builder, than compiled the
script), where hierarchially structered letter stimuli shall show up on
different positions on the screen for 40ms. Afterwards a mask should
cover the stimulus until the participant’s response and the end of the
trial. The problem is, that sometimes the images do not show up at all
or just a grey field appears. More importantly the problem gets bigger
to the end of the experiment, where often no images are shown at all.
The first images of the experiment are often shown quite well. It seems
as if the same problem also happens with sound, but not that worse.