F7t4: GNOME locks up after panel reconfig and sounds added

[Steven I Usdansky <usdanskys rocketmail com>]

Not sure which component this bug should be filed against, so I'll start here.
I booted the Test 4 CD into runlevel 3, ran startx to enter GNOME,
reconfigured the panels to my preferred configuration, and opened the control
panel and enabled sounds. All seemed well.  I then exited GNOME, and followed
that up with a startx command. Upon restart, no panels were visible, and the
system locked up after I right-clicked on the desktop. The problem also occurs
with F7t3/GNOME; FC6 is problem-free.

possibly relevant output from lspci:
00:02.0 VGA compatible controller: Intel Corporation 82845G/GL[Brookdale-G]/GE
Chipset Integrated Graphics Device (rev 03) 
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev 81) 
00:1f.0 ISA bridge: Intel Corporation 82801DB/DBL (ICH4/ICH4-L) LPC Interface
Bridge (rev01) 
00:1f.3 SMBus: Intel Corporation 82801DB/DBL/DBM (ICH4/ICH4-L/ICH4-M) SMBus
Controller (rev 01) 
00:1f.5 Multimedia audio controller: Intel Corporation 82801DB/DBL/DBM
(ICH4/ICH4-L/ICH4-M) AC'97 Audio Controller (rev 01) 

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