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Offscreen rendering artifacts when updating desktop

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Hey guys.. I'm seeing some weird artifacts in overlapping geometry, like small pieces of a polygon suddenly appear in front of something which should actually stay behind it. It stays in the same place and only seems to happen where the geometry is quite dense.. - after reloading the scene it will happen in exactly the same place and it seems to depend on the camera position but still it will happen at the same location. This ONLY happens when anti-aliasing is enabled (4x) AND when updating the desktop, like dragging scrollbars or minimizing/maximizing windows etc.. I'm thinking its some driver/hardware related issue since the engine has been rather stable for a long time, but we dont know when it was introduced. Did anyone see this before, any pitfalls we dont know of?, any hints? thanks a lot. (we just noticed it also happens when presenting the offscreen buffer to an onscreen window instead of dumping the offscreen buffer to host memory as we normally use)

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