Dim (UAC-Like) Screen With Bright Cursor After Switching User And Back?

The issue is that my screen will go dim after switching users or switching users and switching back, its not a set pastern and doesn't happen every time. so i havnt been able to reproduce the issue, however i have had it happen to more then one of my computers and on more then one installation of windows 7 (and windows 2008R2 in one instance).uling out basicly any hardware issue is that my cursor always remains bright and sometimes switching/logout/login will resolve the issue on one account or the other account (no patern)Decreasing the chances of a driver issue is that i have had this problem on 2 systems with different brand graphics over the course of 2 and 3 windows installations respectively all with multiple driver updates and re installations.

Ruling out a connection to UAC is that i have UAC totaly disabled on both machines Heres the rub, i might be doing this to myself... but i cant just except that.instead of having my screen lock after a certain time frame, i use a special screen saver that 'runs a program'. the program ive chosen is "tsdiscon.exe", the executable used to invoke a 'switch user'.when theses 2 computers are left unattended i need the next user to see the user selection screen, ive had too many issues with people not knowing to hit the "switch user" button on the lock screen.ive found all sorts of people having this issue (dim screen bright cursor), but many seem to be dead ends or fixes that only fix the symptoms like the one show here display - Why does my screen dim on a desktop installation of Windows 7? - Super UserIn that case someone suggested forcing the graphics card to use its own color/brightness profile instead of the systems, i tried this and it does seem to work but i want to know why the system profile is screwed up.