I don't have that problem (yet) but I have noticed that when set to 50% brightness via the menus, the VFD has a VERY noticable 60hz flicker that is somewhat unbearable to look at.

I have several other VFDs including a BG Micro and a Matrix Orbital that I have hooked up to the computer and these are both software dimmable as well and do not exhibit this behavior.

Unfortunately at the full brightness the 950 really stands out when the room lighting is completely dark. Oh well. A small price to pay, you could always buy a filter and stick it on the front of the display.