Whenever I try to add an instance account, Thunder appears to replace the instance I’m already logged into with the new one, so I can only browse one instance at a time. Is this behaviour intended? If so, will support for multiple instances be added later?
That seems odd. Are you perhaps removing your account before adding another? This would happen if you are using the log out option to access the account list, instead of the account button.
Improvements to account management are planned.