Comment 17 for bug 1158611

OK, I think I've got a cause, but not a solution as yet.

I've just installed 13.04 onto a new partition, with a new, seperate /home - I'll call it Temp-home(TH) to save typing
On previous installs of Ubuntu, I use an existing seperate /home, I'll call it PH to save typing.
When 13.04 starts using TH, Unity works and I get a status bar.
When I add PH to /etc/fstab, Unity does'nt work and status bar is missing.
Take PH out of /etc/fstab and Unity/status bar are fine.
Not enough room to merege PH into TH.
Looks like there's something within PH that's conflicting and stopping Unity/ status bar from appearing.