I've found the release candidate to be seriously unstable and client crashes have increased by a factor of 3 or 4 as compared to earlier clients. There doesn't appear to be any particular event that causes the client crash as it appears to happen on a purely random basis. Not only does the client crash, but the client window often stays displayed on the screen even though the Windows task manager shows the program is no longer running and I have to log off Windows to get it to go away.