Remember the Browse function is an imperfect tool!!! Just because you can't browse someone doesn't mean they aren't sharing! Many people make this mistake. Also when you are able to browse someone, you don't necessarily get to see all of their files. Just in the same way when you do a search you may get different results one minute to the next. This can be due to many things such as net traffic, available bandwidth for you & the person you're browsing, etc. It's difficult to browse someone who does not have chat enabled. They can also be difficult to browse if their system is not properly configured for p2p. eg: firewalls.