Nook Simple Touch And Calibre

[Jamie]

I use Calibre to keep my ebooks straight because I have oh so many. I use Nook ST and it has always been a breeze to use with calibre until now. I've updated Calibre recently so I'm thinking perhaps that's the problem?
When I plug the NST into the computer to transfer files my Calibre will say something to the effect of "error communicating with device"
I rely on calibre to tell me which files I've already put on the nook because it would just take days to go through all my files on the nook to see what I've got and what I need still.
I can still put ebooks on the nook even though it says it's not communicating it just won't put the little check mark there to let me know it's on the device.
Occasionally when I try to open a book on the nook it will tell me "error cannot open" but not too often.
If I could see what I've transferred from calibre already it would be easier to erase the defective copy and replace it.
Can anyone help me?
Is there anyway to find the older versions of calibre so I can see if I can revert and it will work?

[Jamie]

Wow that makes me feel bright! I was on that page alot yesterday and I completely missed that. Thanks. I'll have to randomly pick an older version and see if that does the trick.