Hi Hemi
As a user of Sharpcap and a 290mc camera, I haven't experienced any of the problems you are having, it certainly is a weird one. The only thing I could suggest is to delete then reload the software to the latest version and re-connect the camera and see what happens.
Certainly sounds more like a software issue than hardware. As recommended, start with a large ROI, centre the planet on the sensor then reduce the ROI , re-centre and repeat the steps until you get to the desired ROI.
With mine, when I am reducing the ROI the planet briefly disappears from the screen but re-appears after a few seconds. Hope this is of some help.
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