Tumblr Dashboard blocked by white square. Can't click anything else in or around.

https://preview.redd.it/igef1kck6ree1.png?width=1366&format=png&auto=webp&s=69646da61b5b9acd14793bb2590e1c7022456761

Hi, like the title says, i've been having this issue for over a month now where i've just got a white square that blocks my Tumblr dashboard whenever i try loading it up. I've tried clearing the cookies and using incognito mode, but that isn't doing anything to help.