Strange behaviour

Hi, we are staring to see some strange behaviour on a couple of wordpress installs:

1. Version 3.4 (single site) – unable to delete from the pages or posts trash folders, when we try we get an error 500 message in chrome and a blank page in firefox

2. Version 3.4 (single site) when creating a new post or page when you click on publish you get an error 500 in chrome and a blank page in firefox, then if you click the breowsers back button and then go to all posts or all pages and then go to all posts or all pages you will see your new page or post.

On one of the sites we did deactivate all plugins and then reactivated one at a time and creating a test post each time

This is really strange, it’s only started happening in the last few days and it was happening prior to the latest WP upgrade.

I have a fresh install of the latest WP on a spare domain and cannot replicate this at all.

Has anyone else experienced this and how did you fix it.

Many thanks

dave