apmount --
I don't run xfce.
I am running Slackware64 14.2 + MultiLib with KDE 4 + the Oxygen Theme.
No such errors on 64-bit VMWare Workstation 12.5 or 64-bit VMWare Player 12.1 ...
Are you running Slackware64 or 32-bit Slackware ?
If Slackware64, do you run MultiLib ?
And how did you install VMWare Player ( SlackBuild, etc ) ?
I see a lot of hits in the google-plex about 'Gtk-WARNING **: Unable to locate theme engine in module_path' but none specifically referencing xfce ...
And I've never seen the proxy.xml message either.
Does everything seem to work in VMWare Player ?
If so, ignore the SPAM ?
-- kjh
P.S. I missed your update from yesterday. Something does not sound quite right, does it ?
With VMWare WorkStation, when I update my 4.4.x Kernel (
about weekly these days
), VMWare rebuilds the Kernel Modules automatically on the first boot into the New Kernel and then it 'just works'.
Just a wild-A** Guess: Are you perhaps running VMWare Player as root ?