Problems with XULrunner and Firefox 17.0 on RH5.6?

Is anyone else having problems with XULrunner and Firefox 17.0 on RH5.6?

Ever since RH put out the announcement that they had to go to FF17.0 to fix a vulnerabililty, it has broken xulrunner and ff for me.

Symptom:

After upgrade, clicking on FF icon causes the kernel to dump me back to the login screen.

Fix:

So far, I can only downgrade back to xulrunner 10.0.12 and ff 10.0.12 to get firefox to work.

Suggestions?