First, I am using AutoCAD 2010 Full on a 64 bit system with windows 7
Now, the problem is that when I try use a crossing fence (upper right to lower left or visa-versa), my cross hairs and aperature disappear and the fence does not show up. Everything is set right in options and it was working before (untill now). I tried restarting my computer, checking the options, pickdrag set to 0. I can't think of anything else. Audit brings back no errors as well as recover.
Technically, the crosshairs are supposed to disappear when you're in selection mode, but they're supposed to be replaced by a pickbox/selection window. However IF the crosshairs are the same color as the background AND SELECTIONAREA is set to 1 (colored selection window) AND hardware acceleration is enabled, the Pickbox and Selection window will be invisible.
Set the crosshairs to a different color than the background OR Disable the colored Selection Window (set SELECTIONAREA to 0) OR Disable hardware acceleration.
Obviously, changing the crosshair colors is the best solution since AutoCAD automatically inverts the display color of the crosshairs anyway if the crosshairs are the same color as the background.