Having the same issue on UE5.1 & 7900 XTX. Grey screen after about 5 seconds opening UE5 (New blank project) and full system lockup maybe 20s later. 100% repeatable so I’m a good candidate to test any potential fixes. Going back to a driver before this card released isn’t an option, so I’m going to try disabling fullscreen optimisations, disable HDR, and see what happens. My DefaultEngine didn’t have a r.OIT.SortedPixels=True line, but I added r.OIT.SortedPixels=False and will see what happens.
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