I don't know if it's just me or it's up to the server, or how the search system should work, but on Lordaeron I can only search once, after that it doesn't give any results. For example "10-19", after searching I waited like, a minute or so and then tried to search for something else. It wouldn't give any results. Can anyone tell me if I should wait longer, and that's how it should work, or is it bugged or w/e?
Yeah there's a "cooldown" between two searches / shift-clicking names, 1 minute or so. I don't know exactly why but I believe it's due to high population (sorry if I'm wrong).
It was originally limited to cover up the fake population count back on Molten, but I believe that is no longer true in Warmane. (Every places are FULL of people. Icecrown, at least.)
One of the Forum Moderators explained before that there is a limit to minimize the pressure on the sever. Probably some trolls had macro to exploit /who search to disturb the server stability.