The same issue happened to me after updating to 3.10. Not only exist on manual settings but also with Auto exposure mode as I noticed a that later. This problem is horrible as it makes the ovf totally anusable. But there is some more. Turning to the hybrid ovf to solve the broblem a new bug appears. This occurs only in manual exposure mode and it is a huge under exposure. Depending the lighting conditions is up to 2.5 f stop. I suppose people buys the x-pro 1-2 because of the ovf. So i hope that Fuji will make soon our cameras workable again.
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XPro2 - Firmware Problem? AF is happening in MF mode