Improper shutdown (power outage) broke UI Designer

I was working in UI Designer when my home power system glitched. Since restart every time I try to open UI Designer I get message "This localhost page can’t be found No webpage was found for the web address: http://localhost:63713/bonita/#/en/home", with variation of the port number each time I restart the Studio.

I realize that generally a UPS would be employed to protect one's hardware from this sort of thing so this issue as a bug is questionable, but perhaps nonetheless this is not desirable behavior. I will be happy to help track down what got scrambled.