I used to be able to see all of my PC systems on my network, as well as map drives to move data back and forth between my Mac and PC's. A while back I stopped seeing my PC's even though I still have internet access on the mac and can still stream between my mac and the apple TV. I have an Airport Extreme wireless N with the latest software and firmware updates. My mac is running OSX 10.5.2.
The funny thing is I can see all of my PC's, Vista and XP and map drives between them. I just can't see them from my mac.
Any help would be appreciated.