Debian Configuration :: Wheezy Xfce 4.8 VERY SLOW First Thunar Startup

I upgraded my main PC's Xfce 4.6 to Xfce 4.8 this morning.Now, every time I start Thunar for the first time after a new boot, it takes about 30 seconds to appear, and then about 10 seconds later, a second instance of it appears.After that, Thunar appears instantly every time I start it during that same session. But if I shut-down or restart my PC, Thunar again takes about 30 seconds to start up, and a second instance of it appears about 10 seconds later.

Google searches seem to indicate that people running other distros are also experiencing this problem. On advice in a different forum, I deleted the ~/.config/Thunar folder and restarted my PC, but that didn't help -- it created a new Thunar folder, but the long delay and the double-Thunars are still there every time I run Thunar for the first time in a session.