For as long as I've had this puta I've been running my monitor at 1024x768 with a refresh rate of 75Hz (that's the best refresh I can get, my video card is shit). Just the other day I changed to 1152x864 and everything was fine, but the image didn't quite reach the edges of the monitor (with horizontal stretch on full) so I changed the refresh rate to 70, problem solved (yes, I'm one of those pesky Alignment Nazi's you see fiddling with the monitor settings at Uni libraries and such :P).
Anyhoo, everything was fine for the whole day (I only really turn my puta off at night), but the next morning I found that my monitor had reset itself back to 1024x768 and a refresh rate of 85Hz. I found the refresh rate odd because I have the "hide modes this monitor cannot display" checkbox ticked, and ordinarily 85Hz isn't there. Said checkbox was now unticked and greyed out. I changed the refresh back to 75Hz (what I used to have it set to at 1024x768) and re-ticked the "hide modes this monitor cannot display" checkbox, which was now ungreyed as per usual. I put the resolution back up to 1152x864 and the refresh back to 70Hz, again with no problems at all. As turning Puta off seemed to trigger the bizarre events, I turned her off and then back on a minute later and the settings were as I had left them. Once again, everything was fine for the rest of the day.
Well I just turned Puta on this morning and guess what? 1024x768 @ 85Hz!!!!! And again the "hide modes this monitor cannot display" checkbox is unticked and greyed out. Apart from the obvious problem of Puta forgetting the settings, I don't understand why the monitor is displaying things at a refresh rate Windows says it can't handle.

Normally if I set the monitor to something it doesn't like the screen goes blank and the monitor's OSD shows up with an error message like "out of scan range".
Here's some info for reference-
MONITOR
Model- Dell D825TM
Driver- 5.1.2001.0 (from Microsoft)
VIDEO CARD
Model- NVIDIA RIVA TNT2 Model64/Model 64 Pro
Driver- 5.3.0.3 (from NVIDIA)
*sends off psychic signals to make Drewgcn return*