Installed Profile Prism and using it successfully except for the monitor gamma feature. When computer starts ppgamma goes into action but a few seconds later it stops and monitor brightness changes. Logging off and back on, the same things happens. I went through the Startup list and disabled most things one-at-a-time but none of them changed the behavior. I am using Vista 64 with an Epson R1900 printer. Cannot find any other gamma software on the system, i.e Adobe Gamma. Have there been other occurances of this problem? 

Don

I'll try!
Have you gone into Display settings in Vista, and followed the trail to Display settings advanced for your monitor and put a check mark in USE MY SETTINGS for THIS DEVICE?
That's the place to start.  See attached scren snap!
Works for me.

Fred