I've just set up a wireless home network with MacBook and 2 PCs. Internet is seamless for all computers. File sharing and general networking is very buggy. PCa and PCb can always see each other fine and share files PCb and Mac were once communicating but PCa and Mac could not see each other on the network at all. After disabling a firewall I fixed the problem between PCa and Mac so they could finally see each other on the network. But literally as soon as that was fixed, PCb disappeared from the Network section on the Mac, and PCb can't see Mac either! I didn't even touch PCb in the process or touch anything related to that on the Mac. So it seems the Macbook doesn't want to work with more than one PC on the network. Any suggestions?