I've had an odd problem and I've been banging my head to try and solve it for a few weeks now. Basically, the image associated with my article has been changed, but the thumbnail image hasn't been updated. Is there a way I can force K2 to flush out the old thumbnail and create a new one?
Some background. I'm using Rok News Stories module, which shows the new larger image(s), but below it are all the old thumbnails. You can see it here: gystmedia.com/briandettor

I've tried re-uploading the image. flushing my site's cache. deleting the old images.

Suggestions anyone? Thx.

Update... I've found that if I delete the article/item and create a new one the thumbnail image works. I've left one of the older items with the mismatched thumbnail up there in case anybody wants to take a look and see if this is a bug.