Hello virtuali, hi juergen (data63),
I have to apologize, it was all 'my' mistake !
It really was the Blue Sky Scenery's LAS2007 HR photoscenery that messed everything up here. Even Shigeo "Shige" Ishii's LAS Vegas 2004 had been corrupted by this hires photoscenery (there must be some kind of a mesh file in it, which creates havoc here). I just disabled all the HR files & everything is working fine now, just perfect ! However, the Blue Sky Scenery's LAS2007 LR (lowres) photoscenery works together with it ok.
So, juergen, thanks a lot ! And virtuali, sorry for the 'stirring up'.
Thanks for the good support !
Kind regards,
Manty