Bridge won't open thumbnails now. why?

Everything was working great in CS3 when today I put some files in from my 20D and when I open bridge all I see is CR2, but no thumbnail images. Recently I did open some jpeg's with camera RAW, but now RAW's don't open at all. Any reasons or settings I need to change back so I can see my RAW thumbnilas in Bridge again?

You might want to try another Raw app like DPP to see whether the problem is corrupt files. This can happen sometimes, like if the memory card is going bad. Did you do anything different in CS3 (aside from opening the jpegs), like change some preferences and whatnot?

Anytime the thumbnails in Bridge start acting up I purge the cache. Seems to work. Worth a shot.
Preferences-Cache-Purge Cache.

Heres the weird part, I put the same RAW files in twice and didn't reopen it. I cleared it and put the files in again ,and now they work.
I had them in the same folder when I put new files in, would that change something possibly?
What is the best way to purge the cache? I tried it while I had images open and it only purged them.

In Bridge if you go to Edit/Preferences and select Cache there is a Purge Cache button.

CS3 Bridge is a bit weird. Purging the cache is the best option when things go wrong. CS4 is better.