ATC window black and low fps

[kaha 205]

Bringing up the built in ATC window it shows black, the entire window is black. In addition fps go down to 40%, like to 20 from 50.

After toggeling the window 2 to 5 times it eventually shows ok, but interaction with it is not working correctly. It does not show  requests in the upper portion of the windowa nd there are no answers from atc. 

 

This problem exists since i did a hardware upgrade followed by a clean install of P3D V4.4 and all of my add ons. Everything else works perfectly. 

 

The only add on that wasn't installed before the upgrade is FSDT Vancouver. 

 

Did someone have a similar problem and is there a solution? 

 

Thx, Karl

[kaha 205]

Seems to be connected to Vancouver. Spawning at CYVR the ATC window opens by itself and shows black. Spawning at any other airport ATC works as designed (and window not open).