Hmm, is it the Keyword search or the Username search that isn't working for you? I just tried looking up a few people with the Username search, had "All Forums" selected on the left, and chose "Newer than 1 year" and it worked for me.
its the username search, but i seem to have gotten it to work, i am thinking i might have the wrong name entered to search. i hit a few names, but missed a bunch.