I have the same issue as @vajeeston; the water molecule just keeps rotating after logging in. I left it rotating last night and this morning it still kept turning around…
I have tried to use the latest versions of Firefox, Edge, and Chrome on Windows 10. I have used two different IP addresses, both in Norway. I have tried to login using my email address and my GitHub account. I did not notice any ad/content blocker that should have made any trouble.
I have used MaterialsProject for several years without problem. This issue appeared some time during this summer and I have not been able to login after that.
I appreciate your support and hope it will be possible to resolve this issue.