Failure to login to scratch org - needs better error message
If you created a scratch org from the Gearset Orgs page and subsequently, that user is deactivated in the scratch org then ...
a) A Compare fails when scratch is either source or target with an ugly error suggesting you reauthorize the org - but you can't reauthorize scratch orgs from within Gearset
b) A login to that Scratch Org from the Orgs page fails with an HTTP 500 error and makes you think the Gearset server is down/broken
Basically, when login target is scratch org and login fails, suggest a more context-aware diagnosis & remedy