All Minecraft fans: What the heck is wrong with LAN world?

We have a few computers, and a network we share, but lately we have been having some problems with LAN world. For example: My brother makes a world and then puts it on LAN, I go to multiplayer -- I wait for a second to come -- it shows up on my screen -- I go there -- Then it basically says there's something wrong with the "Host, no further information!" It used to work, but now it never works, no matter how hard we try! We do NOT have the same account, so it SHOULD work. We're hooked up on the same network, it SHOULD work. We have no problems with are internet whatsoever, so it SHOULD work! I also read online that other people have the same problem. Don't show me a list of problems or anything because we have NO problem with are Wi-Fi. We do however live in Nevada, which I'm not sure if it makes a difference or not. But, what the heck is going on? Thumps up for my writing! Most people that play Minecraft don't know how to write cause their retarted.