This happened to me a few months ago when i started using the beta with one computer running win8 and one running windows 7. It only lasted a few weeks or so and then went away (very weird).
I recently wiped out both computers and installed fresh copies of windows 8 on both. Ive had problems with sharing ever since.
The most recent problem I have is that when i go to "network", i can see my other computer there. When i go to click it, at first it gives me a network error. Once i wait for a minute or so, then its perfectly fine, so i dont understand why it has to "warm up" or something?
This is the error:
It doesnt seem that damn complicated to set up sharing across a network in windows 8, so im not sure where im going wrong.
Anyone else having this problem were your networked computer has to "warm up" before working? (and just to clarify, the wait time is about 60 seconds - much more than it would take for just something like a hard drive to spin up or something like that)