Happy to help.

As for rigs other than this one, I typically use Ubuntu Server purely for ease of administration. The lack of a gui also appeals to me, especially for a headless rig, as there's no point in wasting cycles on a gui that's not going to be used.

As for the 7.x series on linux ... I discovered that 7.0.18 would trash CEP2 and HPF2 units almost instantly and reliably on Slackware 13.37 x86_64, Ubuntu 10.04 x86 Desktop, 11.10 x86_64 Server and 12.04 i386 Server beta. Other work seemed to process ok. I posted to the alpha list and WCG forums but never got any response so I went back to 6.12.43.