Screen Freezing

[GreekSpy2001]

Hi

Over the past week I have noticed that the ARNB screen is freezing when I use my screen switch to switch from PC to work laptop.  I have employed this method for a couple of years now but all of suddent his problem has arisen.  If can take upto minutes for the ARNB screen to recoover and seems dependent on how long I have switched away from the PC. 

As I said have employed this current hardware for 6 months with no issues with screen switching or so but it is recently that this has happened. 

Running 4.03 in 2D mode on a 64bit Win7 DELL PC with fast processor aand 12GB ram.

Any ideas?

Graham