[Roach]

There are HL1 engine exploits all over the place out there. It's annoying, but they still exist, and since Valve doesn't seem to want to patch the bugs, you unfortunately have to grin and bear it. Hopefully you can catch the logs prior to the crash and see exactly who did the crashing.

As far as the chat thing you are seeing, thats normal. It's just using say_team @ "text". I do it all the time on CS servers when I'm chatting w/ friends who are admins.