Forward Overhead Panel kills Graphics

Hi,

I have the following problem:

I am sitting in the VC, the NGX is setup for flight, my FPS is in the range of 35. When I open Views- Instrument Panel- Forward Overhead Panel, it does not open and the FPS unrecoverably crash to below 10 with stuttering graphics.

Further, the mouse cursor appears permanently on the screen as a flickering ring (like the ring which appears in Windows when it's loading something. I still can click knobs, switches etc. but the symbols for the mouse actions do not appear).

This does not happen when I open other panels via Views- Instrument Panels, like CDU, Aft OH Panel etc. They open up normal and can be closed without impact on the graphics.

I am running W7 64bit, i7 3930k @ 4.7 Ghz, GTX680 with 2 GB in widescreen configuration (5760x 1080), 16GB RAM.

Anybody else suffered this issue? any thoughts about it?

Thanks for your help,

Ulrich