Something weird with "Small Cover"?

I have updated “Small Cover.jpg” in my materials folder, but the Inform IDE keeps showing an older one. The exported release small cover is correct though, so there’s not a huge problem except that it always makes me feel something is wrong.

Anyone else had this happen?

I’ve tried trashing the entire release folder instead of overwriting whats there and that somehow doesn’t seem to help. Is the IDE caching the image and then never updating it?