Please update to latest Bridge 10.0, issue should get resolved.
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I am having problems with the full screen preview too eventhough I just updated to the lates Bridge (10.0.3.138). When I press the space bar I see a pixelated image eventhough it's a RAW file. Some images are less pixelated than others the ones which are not pixelated are shown in a very poor quality. I'm using a brand new MacBookPro (16GB RAM) with the latest version of MacOS Catalina