It is probably something silly, but...
I have just set up a Time Capsule, and it connects to the outside world, and one of the two Macs in the house can connect to it at a time - but not both.
Is there a setting I'm overlooking somewhere?
(I have the up-to-date Airport Utility, 5.4.2, and I upgraded the Time Capsule firmware to 7.4.2. The machines are a Mac Mini and a MacBook Pro. At some point, I want to get my Windows XP laptop - work machine - to connect too; that has problems with not supporting the more advanced network security that the Macs support.)