A corrupted file on the server or possibly even scripting for the skin itself could crash the server. Your best bet is to enable logging to find out what's going on. Unfortunately normal Q3 logging doesn't work, but there is a workaround.
On your commandline add the command "+set developer 1", this will produce a file called qconsole.log in your MOHAA\main directory. One caveat tho, using developer mode blasts both the console and the logfile with every little bit of info it can about every little problem it can find even if it doesn't effect the game/engine at all. Be prepared to see alot of useless info, but what you want is prob right at the end anyways.
