See my forum post today “Only HTML, no VISUAL display of post after restore” for a similar problem.
Something is very wrong. 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 default theme to rule out any theme-related problems?
– resetting the plugins folder by FTP or phpMyAdmin? Sometimes, an apparently inactive plugin can still cause problems.
I deactivated all plugins, and upgraded to 2.8.5. No fix.
I reactivated the two plugins I had. No fix.
I have tweaked so much of the theme that I am not about to load a new theme and then reload the one I use. (Though I do back up the modified theme I use.)
Which php file manages the edit page? i can compare my version with the baseline and see if I inadvertantly changerd it. Doubtful though since all of my tweaks have focused on the display of the posts, not the editing.
I have tweaked so much of the theme that I am not about to load a new theme and then reload the one I use. (Though I do back up the modified theme I use.)
Did you tweak the default theme? If so, you can protect your customisations. The theme could be the source of the problem if it includes custom functions and/or JavaScript.
I don’t think there’s a single file that manages all of the page editing functionality but, if you’ve only edited theme files, you’re unlikely to have introduced a core issue yourself. That said, you could try re-uploading the wp-admin and wp-includes folders via FTP in case you have a corrupt file that wasn’t corrected during the upgrade.