I suspect it's a driver or compatibility issue, but I have installed patch 1.2, 1.3, 1.5 and I'm running latest version of DirectX 9c, latest drivers for Nvidia GeForce4 MX 4000, I used Auto-Detect for best settings to set-up RTW for BALANCED Performance, Maps: 1024x768x16, AA: No, Terrain: High, Building Detail: Low, Grass Detail: Low, Unit Scale: Normal, Unit Detail: Low, Effects Detail: High, Vegetation Detail: High.

Any suggestions?