I believe this is because HL takes screenshots from the backbuffer and the latest ATi drvers don't preserve the contents of the backbuffer between frames.
Additionally it might also be interesting for admins to know, that taking screenshots with HL with some (less common) cards leads to a compleat hang of the system requiring a hard reboot. So if a user suddenly dissapers when you take a screenshot of him, it might not be becuse "that darn cheater realized he got found out and left" but that you actually crashed his comp.
BTW, this is not some rumour I picked up from somewhere started by cheaters, I happen to have such a card myself...
PS ...and whenever I play a clanmatch on a server that has the AMX matchscript that "helps you out" by forcing you to take a screenshot at the end of the round it always ends in a long discussion of why I want people to turn that crap of since they are highly suspisious of exactly why I don't want a SS taken :P.
-- /Stefan
Software never has bugs. It just develops random features. =)
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