I am now working with C2 on Win7 64 Bit and 8 GB of RAM. From time to time, when starting the preview C2 freezes. If iam lucky there exists a recently saved version (or automatic backup) otherwise I usually loose a bit of work.
I suspect that the problem relates to me having C2 files directly in the Dropbox folder. I think that the error that freezes C2 is some resource unavailability exception -- perhaps related to dropbox locking a file during upload to the cloud that C2 requires.
Usually, when it happens I have to kill a newly spanned C2 process (using task manager), which kills C2 also. I then also exit the dropbox software and start again.
It would be great if C2 code could be checked to ensure that when a resource needed is unavailable (such as locked by another process), that it doesn't freeze C2, but only notifies and waits until the resource is available again ...