Started getting the very general Cyberpunk 2077 has flatlined error on launching the game after the 1.12 update but hadn't launched the game for a few weeks so couldn't be sure if it was the update causing the issue..... Anyway turned out to be the very obvious cyber engine tweaks needed to be updated and it works great again now.

The point is I had tried all the complicated troubleshooting thinking it was something major, when it was a really easy fix. Reinstalling the game didn't fix it...

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