Hmm, Not only because its december. now i know i dont do much. the amount of bugs not getting down, the go up.
When i move my mouse pointer in windows 7 64 bit in the menu a bit left to right etc. and click some option sometimes the pointer dissapear complete from my screen.
When you move the mouse up and down so you get the pulldown then it dissapears most of the times if you move a bit. Its hard to explain, move around in all directions , open en close menus and it happens.
It only seems to come back then when you click inworld