Have you reconfigured the access for svchost.exe? If so, this could be caused by the svchost.exe bug I mentioned in the other thread. Try to add two rules, which allows the following (for svchost.exe):
IP, IN, Source: Your network zone, Destination: all
IP, OUT, Source: all, Destination: Your network zone
(add them on top of the existing rules and try again to browse network locations)
In either case you should check your firewall log of Comodo.