iTunes (MBPro17) sharing FREEZES iTunes

[Kevin Callahan]

I have 4 macs on my network (g4s and g5s, one MBPro) -- sharing  
(Bonjour) works like a charm -- or did, until the recent iTunes/QT  
updates (or perhaps 10.4.9 update?)

When turn sharing ON on my MBPro17 library (which is small), it  
freezes iTunes.   The titlebar grays out -- I can't access the window  
controls - can't open any iTunes menus.  I've restarted the machine  
and have been able to reproduce this several times.  I can't make  
iTunes the active app.   When I go to restart the machine, I'm told I  
can't restart because iTunes fails to quit.  I've trashed the prefs.   
No luck.

The PB17, G4/500 and the iMacG5 have no problems showing up under  
Bonjour on the MBPro.   The MBPro doesn't show up on anything else.   
The MBPro is on my n-only network. The other machines are on the g- 
network (bridged).

Suggestions on how to solve this ?

K