I've been flying th PMDG 737 and I use the right-mouse button hold to look. I also use TrackIR. Midflight I noticed the scroll button will not work to zoom in/out sometimes. Also, a white dot will appear during mouselook as well in some situations, too. Closing FSRealistic v2.0 Pro will solve these issues instantly.
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Hey, the zoom issue is a known issue and we are trying to solve it these days.
As for the white dot, this has nothing to do with FSRealistic.