WebDAV sync stopped working with 2.0b4, it says wrong account settings?

I had Zotero 1.54b running for quite a while with a WebDAV account from mydisk.se (because they offer free 2GB) and it worked fine. I recently upgraded to 2.0b4 and it stopped working :(

When i try to sync or hit the "Verify Server" button in preferences it always tells me that:
"The storage server did not accept the username and password you entered. Please check your storage settings or contact your server administrator."

I have now triple checked that the url and my username and password are correct, but it still says that.

Any ideas?

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