Bert,
Thanks for the inquiry. I am only seeing crashes on the client machines. Never had a crash on the main (database) computer, which is an Intel Core 2 Duo with 3 GB RAM, running Windows XP. The network is peer-to-peer. The clients vary from Pentium 5's with 1 GB RAM running XP, to my personal PC which is also a Core 2 Duo with 4 GB RAM (of which Vista absurdly only sees 3 GB), running Vista. My Vista computer probably has 2 to 3 times the crashes (almost daily) as the XP PCs. The crashes only involve AC, and usually when I am signing off Imports or looking at Imported Items. I do have a client PC running Windows 7 RC, but it isn't heavily used, so I can't estimate the crash frequency.
I would be more concerned if I was losing data, but no problem fortunately. I have had an IT person check the network setup, and he claims it's a problem with AC, not the network or individual PCs. He found that AC had problems with Acrobat 9 on my computer but not with Acrobat Reader 7 on my staff's PCs. As far as my Vista computer, he just says that Vista causes problems with permissions on networks (the explanation was more detailed than that, to be fair, but I can't remember the specifics). I could roll back to an earlier version of Acrobat Reader, but I have the full Acrobat 9 program which allows me to electronically sign PDFs coming from the home nursing services, PTs and so forth, and saves a lot of time and paper. I was also advised it would be simplest to downgrade to XP on my computer, but I can't face the hours of backup and reinstallation that this entails. I've already preordered Windows 7 on Amazon, and I'll take my chances.
Boy, I wish AC ran on Macs.