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I have (kinda) successfully updated from 2.3.1 to 2.6.4 with no errors. Front end is fine, can post and comment. I had disabled all plugins and reverted to the baseline theme before upgrading.
Dashboard for most links displays munged Categories settings content without CSS. Cannot change the theme or reach the plugin settings. Tagging settings page throws the "Something has gone wrong" error.
I enabled debug=true in the config file but am seeing no errors.
Any clues would be appreciated.