Not tried Ubuntu Host but have OpenSuSE 12.1 and this happens for WIndows 78 guests
I also use openSUSE 12.1 but it didn't happen with my recent install of Windows 8 RP. I don't think it happened on Ubuntu 12.10 (Quantel) - atg least I didn 't see it.
I have the same issue. Using Win7x64 and XP as guest and Ubuntu 12.04 as host (kernel 3.2.0-30-generic). In both machines the same problem.
At the same time the list of available machines is lost after reboot.
The preferences file in ~/.vmware is not read. Access rights are correct.
Vmware Player 5.00 build 812388
In the guest system vmtools have been installed without error message.
Upon start of the guest OS the message that vmtools have not been intalled is displayed.