ASN XGauge freezes FSX graphics

Hi all, I just purchased ASN and it works great!

But I have a problem with XGauge; I use it with IFly737NG in VC, and all works good if I leave the Xgauge windows docked in the virtual cockpit.  If I try to undock the XGauge window to move it on another monitor, it does, but FSX graphics freezes, not the simulator, just the graphics, I can hear the engines noise changing if I move throttles, and all the other sounds are telling me that FSX is working, but on the screen nothing moves from the last position. 

Closing XGauge does not solve, I need to restart FSX.

Anyone experienced the same problem?

Mauro