A problem has developed on my MBP running Mountain Lion. I have 3 Macs in my home, the MBP, a G5 power mac, and a Dell Hackentosh. The G5 and Dell are both cable connected to the router. the MBP is usually wifi. Previously, I had no problems connecting to any of them from any of them, thru file sharing or thru screen sharing. Lately, I've found I can't connect from the MBP to the other machines thru WiFi. I get can not connect errors, or even it doesn't see them on the network. However, I have no problems if I plug the ethernet cable into the mbp. Then I can connect in anyway I want. (I do not know if I can connect TO the mbp from the others when the MBP is on wifi) Restarting the mbp or other machines have no effect. Anyone have advice or experience in this?