Corrupted thumbnails??

I use Lightroom 2 to import photos onto my Mac Pro (Snow Leopard OS), then move to Adobe Bridge (most current version) to browse and choose which to open into Photoshop CS4. On a recent shoot, about 5 to 10% of the images (taken on three different compact flash cards) from my Canon 5D Mark II had corrupted thumbnails in Bridge. They either showed no image, just the CR2 RAW logo, or the image showed with a significant portion of it blocked by random colored vertical and horizontal lines. The photos all were fine in Lightroom. I closed Bridge, threw away the cache, and reopened and all was well.
My question is what is going on? Getting rid of my cache is a pain, because I have to wait many minutes for many files to reappear in Bridge. Is there a way to prevent this from happening again? Could it have been related to the fact that I imported 700 or so very large files (RAW files from a 21 megapixel camera are 25 to 30 MB each)? Thanks!!

I closed
Bridge, threw away the cache, and reopened and all was well.
You first could have used the option to Purge cache for folder using the
Tools/cache menu instead of deleting the whole cache folder.
I use Lightroom 2 to import photos onto my Mac Pro (Snow Leopard OS), then
move to Adobe Bridge (most current version) to browse and choose which to open
into Photoshop CS4.
If you only use LR to import your files why not use Bridge for this?, You
can add several options for it in Adobe Photo Downloader that is in Bridge
(get photo's from camera). Explore the advanced option window.
My question is what is going on? Getting rid of my cache is a pain, because I
have to wait many minutes for many files to reappear in Bridge. Is there a way
to prevent this from happening again?
It might have been a corrupt folder but it might have also been something
else. I tried using LR for import files (include to convert as DNG as I'm
used to for all my Raw files) but have no problems with viewing them in
Bridge. Personally I prefer the renaming options in the Photo Downloader but
that's my opinion )
Could it have been related to the fact
that I imported 700 or so very large files (RAW files from a 21 megapixel
camera are 25 to 30 MB each)? Thanks!!
I really doubt that, (I have the same files, did not try this amount but do
work with this amount, and more in Bridge without this problems) unless you
did something in between with removing card from reader in an incorrect way
or closed one of the apps during caching but still can't imagine that to be
the cause, or if you copied the files manual to an other location, etc. etc.
Nevertheless you might consider to refresh the preferences for Bridge (hold
down option key while restarting Bridge and choose reset preferences)

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