My M1001 has been working great. Then I upgraded to iTunes 8.1.
Now I have a host of issues.
4) I have made no hardware upgrades or additions other than upgrading the firmware on my Linksys WRT65GS router ver 5, but this problem was there even before I upgraded the firmware.
Which did you do first?
It's not very clear but are you saying that it works but only when everything is connected via wireless?
Does everything work when you use Ethernet cables to all devices?
Does the problem only occur when using a mixture of wired & wireless connections?
If you answer Yes to the last three questions then it sounds like you have a multicast problem & the culprit is most likely your router, Bonjour or a firewall.
Was one of the Apple related products you had to reinstall Bonjour?
What firewall do you run on your computer?
(Note: the router firewall plays no part in this so leave it alone)