Posting Ads logs users out
I just updated to the most recent version, and everytime my users get to the post an ad page, they select a category and it logs them out.
More specifically, they select a category, it goes to load the sub categories (if there are any) the spinning circle stops and it instantly directs them to "Whoops! Page Not Found".
Also, I have disabled all plugins and am still getting this error.
Whats going on?