I play an MMO (Runescape) and just the other day Steam wanted to update my ATI Radeon HD 4650's drivers to the latest version.
I usually don't update drivers unless something is malfunctioning, but I did it anyway just because maybe there might be some unforeseen graphical improvements it might bring. ...Well, the new drivers conflicted with the DirectX version of the graphics model that Runescape uses, so the game kept glitching out in places.
I'm manually installing an older version of the driver, since Steam doesn't keep a rollback version of the drivers when it updates them. grr... if only I had gone with my first instinct.
(ie. I updated my graphic card drivers and it broke my game.)
Has this happened to you guys in a similar circumstance? This is a gaming forum, so I'm sure it has.