this happens to me relatively often: a computer on my workgroup refuses to show up in the Workgroup computers listing (My Network Places -> MS Windows Network -> Workgroup), when it has shown up there just fine the day before and will probably show up just fine the day after. further more if i try to access the computer directly with // this will work (although sometimes it wont). pressing f5 to refresh does nothing. pinging the computer will sometimes fix the problem but not usually. rebooting one or the other computer will sometimes fix the problem but not usually. to make things even more frustrating, often the one computer that i cant see (Computer A cant see Computer B for instance), has no problem seeing the computer in the reverse situation (no problems with Computer B seeing Computer A). this has happened to me many times on many different home networks. in the latest circumstance, all computers are running Windows XP with all of the latest updates :/
