I guess I'll start with the important stuff - I'm a PC player and I use Gadwin to take screenshots. It has been working perfectly for me in every game I've played, except for the Dragon Age games.
In DA:O, if I take a screencap, there's a 50:50 chance I get a proper screencap or I get
THIS DA2 throws a few more "fun" things in, so in addition to
THIS, I also get things like
THIS or
THIS.
Just to make sure: those things only show up in screencaps, not in the games themselves. The games look fine. It only happens with those two games, so the fault must be in Dragon Age, but I just can't figure out how to fix it.