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Have you tried:

– deactivating all plugins to see if this resolves the problem. If this works, re-activate the plugins one by one until you find the problematic plugin(s).

– switching to the Twenty Ten theme to rule out any theme-specific problems.

– resetting the plugins folder by FTP or PhpMyAdmin. Sometimes, an apparently inactive plugin can still cause problems.

Problem solved.. The faulty plugin was Block-Spam-By-Math-Reloaded. Thanks Esmi!

Thanks for identifying the culprit plugin. I’ve added it to the Plugin issues post on https://www.ads-software.com/support/topic/troubleshooting-wordpress-32-master-list