I'm looking in to this. Could everyone, who hasn't said already, please tell me their operating system? If you run linux the output of "uname -a" would be nice. I have setup a new build process for compiling the client for all four platforms, and I did a small beta test and everything seemed to work, but these problems might be related to that.
The one error I see now is that any linux computer with a kernel older than 2.6.27 will error out. I have fixed this and have new linux binaries I'll push out soon. But I'm not sure about these long workunits that aren't finishing. I have to check and see whats going on.