FS9, Video card memory reload?, RQ assistance

[Emile 28]

Hello,I fly on a P4 2.4 Gh, 1 Gb RAM, 2 monitors attached to a GF4 TI4600, drive StarStorm 52.16. FPS mainly at 30 during flight.Since a few days when in SPOT View, when taxiing, flying the game freezes during 1-2 seconds on the primary monitor, the screen flashes, the scenery is reloaded, the aircraft is re-"build" in black (see screen shot attached, not easy to take the screen shot at the right moment) , the aircraft texture is re"loaded" and all is again normal (see screen shot).This can happen several times during the same flight ..but not systematically.It seams that the memory of the video card has to be re-loaded...In the screenshot on left side you see the secondary monitor with the 2D panel and FSNav, on the right side the primary monitor with the aircraft in spot view.Any recommendation?Thanks in advance

[Emile 28]

After removing some Demo free mesh, sceneries files for USA, British Columbia, the problem seams to be solved.