I cannot update any of my scores or load new scores

I am using Musescore 3. When I try to save online, things used to work well.
then about 5 months ago, I was not able to save new scores, but I was able to update old ones.
What happened was this when I updated scores.
1. I click "save online"
2. A box comes up listing the score, with a button labled "continue"
3. I click the "continue".
4. A completely blank box comes up.
5. I eventually get an email saying that the score has been updated and it has

Now nothing works. When I click save on line I get a box that says
Cannot upload: Internal Server Error (An internal server error occurred.)

Have I exceeded some max? Do I need some special login now?
My login is 0499gdell

thanks for your help.