I have the same problem.
This is what I got from “support@axure.com” :
Thanks for writing in about this! It looks like some users experienced not being able to access prototypes due to some testing. This has been rolled back and the issue should be resolved. Please try loading your prototype once again, and please let me know if you happen to run into any further issues.
Thank you, and please let me know if you have any questions!
Now, our custom password pages are gone and the default page opened has this at the end of the URL “/resources/expand.html” opening a blank page.