The Specialists is the only HL1 mod I play often, and while Natural Selection and HL1 run fine for me (though I'm still new on NS so I haven't played as a commander), The Specialists crashes after about a half hour or so of gameplay and after restarting steam (the crash leaves a large rectangle in the top left part of my screen and the only way I know to fix it is to restart), it says "This game is currently unavailable, please try later" or something similar unless I reboot OS X. Anyone know why?