GNOME hangs on startup when using "advanced" themes

[Goaengel]

Dear FreeBSD-GNOME members,

I experience a problem as follows:

On gnome 2.22.1which is basically running fine I experience hangs at 
startup, when I choose a more advanced theme (basically anything else 
than Clearlooks or Mist). This only happens when exiting GNOME back to 
gdm an reentering it from there. After a reboot it works fine.
Also starting it via an XTERM does not help, neither displays error 
messages that help (only error that trackerd is already running and 
cannot replace)

I am running RELENG_7 with a custom kernel, ports are up to date.

I recall this being a very old problem, I have experienced it about 3-4 
years ago on Debian, too. Being unable to "tweak" my DM as I want, I 
switched to KDE. Now I am giving the GNOME a shot again, but still this 
annoying behavior.

Any hints would be appreciated. Please let me know when you need any 
kind of log or similar.

Please keep me on cc, since I am not subscribed to the list.

Regards, Tino