Downloaded the latest F15 test ISO (may no longer be the latest though). After installation, most things were ok. I attended an IRC meeting with xchat running on it ... cool.

Then, I decided to update (was hoping to catch the latest gnome-shell with the vertical workspace pane).
Oh no ....
I can't get past the GDM. The GDM dialog keeps flashing along with the warning sound notification (looks like a pseudo crash ... where the buttons actually work if one persists but the blinking and accompanying sound is really disheartening and annoying.)
Has this been fixed? Will another yum update fix this? If so, how do I connect to a wireless internet network via networkmanager at level 3. Looks like I need to run that update strictly on a terminal environment. Reverting back to the ISO boot image/kernel (2.6.38-0.rc5.git1.1.fc15.x86_64) does not correct this issue.