Khajiit hit sound
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I had the exact same problem, I agree! I installed a campaign for testing, then deleted it. And now saves don't work, and the modification button also doesn't work.
RedHeavenHero, it seems the problem is still with your campaign.
The solution helped: I created a new profile, and saves work there. However, it's a pity that settings and progress in the original campaigns were reset.
Thank you, it helped.