When we try to load our categories & sub categories in the admin area the loading icon displays for an eternity and nothing happens, you have to refresh the page to try again.
We noticed this whilst trying to use the AB-Addon SEO Page Filter, we have disabled every add-on apart from the AB Addon Manager but nothing seems to fix it.
When we try to disable the AB Addon Manager through the admin area, the same thing happens as above, the load timer continues to spin and nothing changes.
The site is small, there arent that many categories/sub cats
Any ideas, what this could be? And how to fix?