Sourcetree fails to search for remote repositories the first time the application is loaded. An "Oauth Access Token Expired" error is displayed.
The only way to resolve this is to refresh the OAuth token manually from "Edit Hosting Account" within Sourcetree - After this things seem to work as normal for a while.
This issue re-appears frequently - It doesn't look like Sourcetree is automatically refreshing our OAuth tokens. This is affecting all users and only started appearing recently - Previously we were set-up with SSH and not having any issues.