Has anybody else notice this (I have a few times)? A few occasions I have done some pretenders in order to view some clips that have a couple effects applied in real time. This works fine, but sometimes I noticed that if I 'Clean' the prerenders (which does remove them from the folder I specified for the prerender files) and make some changes to the effects and prerender again, Vegas will use some of the older prerender files instead. If I close the project and reopen then everything is fine.

So I am wonder, does vegas somehow cache these prerender files somewhere and uses the cached files on the timeline?