I'm so sorry - I misread your original post. We haven't had any other reports of this, so we're not sure of the cause at this stage. Could you try the following to see if it will help:
Restart IIS, then try logging into Passwordstate again
Clear your cache in Chrome, and then try again
Go to the Help Menu in Passwordstate, open the Web API Documentation page, and then open the Standard Documentation - does this load okay
And can you check if this is working for any other users?