ATC and Dual Monitors

I asked this question in the hard ware forum, but haven't had any responces.
I'm running dual monitors, I normaly place the radio stack, gps and the atc window on the second window, all was great and working fine untill about a week ago, when the atc window stopped showing the text for atc.
Works fine on the main monitor, but when I undock it and move it over to the second monitor, Bam no text. I've tried and searched for the cause with no luck.
Does anyone have any ideas on this?
Steve
I'm running dual monitors, I normaly place the radio stack, gps and the atc window on the second window, all was great and working fine untill about a week ago, when the atc window stopped showing the text for atc.
Works fine on the main monitor, but when I undock it and move it over to the second monitor, Bam no text. I've tried and searched for the cause with no luck.
Does anyone have any ideas on this?
Steve