I am unable to edit pages. When I try to do so I get a 404 error whether I click update or preview.
This only seems to apply to pages. I can edit posts.
I use the suffusion theme, but have switched the theme to 2010 and have the same issue.
I have tried deactivating all plugins without success.
I have repaired tables in phpMyadmin to no effect.
I had the problem in 3.5 before updating. It may have started earlier.
What should I try next?