Thanks for figuring out the answer! After you said somehow the categories were deleted, I remembered that my issue with the 500 internal server error happened after I went into the MENU tab and created 2 categories with one being in the hierarchy setup.
HOW TO FIX THIS ISSUE: Go into the “POSTS” tab and click on categories, if only one is showing select that one and “EDIT” then where it says “parent”, select one of the other categories and update. They should appear back on the main categories screen. Now DELETE the categories that were created. If you still don’t see the categories you made keep messing with it until you find them and delete them! I just did this after wrecking my brains for 5 hours and figured it out.
Now when I click the MENU tab no 500 error it has re-appeared!!
Really hope this helps all and anyone that has this horrible issue. I will be contacting WORDPRESS tonight to find out what is the deal with this CATEGORY issue.
Good luck!
