Can’t add new posts or pages in 2.9

Hello,

Trying to add new content to https://www.longlifehappylife.com is not working – add pages or posts.

I upgraded to 2.9 while moving this site over to the server it is on now (MediaTemple DV). Haven’t been able to add new content since.

1. I’ve already deactivated all plugins, deactivated themes, deleted cache and tried logging out/back in. Still not working.
2. I’ve already checked my database user permissions and that my wp-config file logins are correct. Still not working.

I’ve gone through every thread I can find on the forums and elsewhere – nothing seems to work. I’ve got 10 other WP installs on the server that are running without incident.

Any help is much appreciated ??