In 2.07 I can go to products, categories and add products to categories, remove products etc.
From the product, I can see what categories the product is in and make changes.
The upgrade to 2.1 went flawlessly. No errors
I can see the categories in admin and see product in a category - but if I try to remove a product (uncheck) and save it gives me the error Something went wrong while saving the category.
If I go to products and edit a product in the category box I see nothing. If I try to search for a category it does nothing.
It does not allow me to save from product.
If I CREATE A NEW CATEGORY and add products to it - it saves.
COuld someone please please help. I thought I might have messed up my old upgrade and did it all over again - but the resultis the same.
I am on PHP 7.09 if that matters
In the deep logs I saw something about forms and opts.
Maybe you can't delete last item in cart if Minimum Order is Enable
In the first time, I think you override data in 2.1 that cause to conflict with double data. It seems to be same as two different names with a same number in your phone. When you find this number, nothing can be appeared. If you check again, I am not sure about it. I think you can try again with a magento upgrade extension to upgrade magento to 2.1 properly.