elpis2000

I also had this problem. But, I noticed that wasn’t because of plugins. That was from wp_option’s data. If you have that problem, First, delete rss_*,records in wp_options table.
and disable sources to get recent rss data on dashboard.

Um. I also had the problem. that’s because of incorrect role upgrade for wp_option table.

If you can edit your DB, Insert below on the record,wp_user_roles’s option_value of option_name field in wp_post table.

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good luck.