Yast + gnome + 9.1 = not working

I was excited to hear that 9.1 included a nice working version of gnome 2.4... however, after installing I discovered that I can't open Yast while in gnome. After entering my su password in the prompt, I get a "Timeout when trying to execute 'su'." error. I can run it from the command line. Any ideas on a simple fix? m