Anyone knows what this could be?

I have a really annoying issue with DotP 2012. When a card can be played, can be attacked with etcetera that card has this glow around it, right? Well, for some reason, that glow keeps moving at me. I don't mean animating, I really mean it moves to another spot, then back at the card, then back to that spot, etcetera. Especially annoying if it happens with multiple cards.
Also but fortuntely not as frequent (the above issue happens pretty much from turn 1 through the entire duel), sometimes the top card of a deck turns black - normal - black - normal.
And very rarely some grey triangle appears in a random spot in the same fashion, as if my videocard is dying or overheating. It's brand new and the temperature is, for a videocard, very normal. Gets hotter with most games but still never even near overheating, and even in those games I never have issues! So surely it's neither of that?
Yeah, I've also posted it on the Steam forums. But I guessed it'd be a good idea if I'd post it here as well. You know, to double the chances that someone who knows how to fix this reads it.
Also but fortuntely not as frequent (the above issue happens pretty much from turn 1 through the entire duel), sometimes the top card of a deck turns black - normal - black - normal.
And very rarely some grey triangle appears in a random spot in the same fashion, as if my videocard is dying or overheating. It's brand new and the temperature is, for a videocard, very normal. Gets hotter with most games but still never even near overheating, and even in those games I never have issues! So surely it's neither of that?
Yeah, I've also posted it on the Steam forums. But I guessed it'd be a good idea if I'd post it here as well. You know, to double the chances that someone who knows how to fix this reads it.