Hello,
Since I upgraded to 3.99 full version, I have been unable to edit any product variants. I don't get the drop down menu anymore, and when I click on variants in the edit product page, it refreshes the page I am on. I have not fully tested the error, but I believe this is occuring for all of the other menu items as well, but I originally noticed it using variants.
Any help would be appreciated.
EDIT: In case it matters, I did also apply the hotfix.