I've run in to a bit of a wall with viewing my data. It seems like ArcMap will just stop drawing data when I make changes, like modifying a feature's appearance, checking/unchecking visibility of layers, etc.
I can still edit anything I want, but nothing is being displayed except for a blank white map, even when there were features there before. If I exit out of ArcMap, I can see everything loaded on to the map document for a split second.
I'm not sure if this is more of a hardware issue than software issue, but it makes things hard to use as every time I make a change to something, I pretty much have to close ArcMap and load up the map document again.