Hundreds of pre-filled custom fields at new post.

Looks like raw data is being pulled from the wp_options table rather than being parsed. Deactivate all plugins and check to see if this resolves the problem. If it does, activate the plugins one by one – checking the post after each re-activation – until you (hopefully) find the problematic plugin.

Good thought – and just gave that a try – deactivated all 13 plugins, and still got the hundreds of custom field boxes. Same data, too.

I’ve got a horrible feeling that something’s damaged a table. After re-checking the screenshot, it may not be wp_options. Could be wp_postmeta. Might be worth checking the latter table to confirm it.

Hmmm – I’m got 848 values in wp_postmeta with a meta_key of ‘delicious’.

139 of them have unique post_id values… the rest all have a post_id of 0

Oh – that sounds very suspicious! Backup the table and remove records with a post_id of 0?

So… I think I’ll answer with “sortof”.

Removing the records with a meta_key of “delicious” and a post_id of 0 DID remove them from the ‘Add Post’ page… but the page still takes a few minutes (closer to 5 now) to load, and the custom fields box still appears (with ‘delicious’ being the only option in the dropdown…

A step forward, at least!

Appears to have worked for me as well.