Currently, (in "centralized mode") if a server cannot be contacted, the plastic client GUI won't open, even if there are multiple profiles, and another server IS contactable. This appears to depend on the last active workspace - if the last active workspace belongs to the server that is down, the tool can't be opened.

It would be extremely beneficial to be able to open the tool, and select a different workspace weather the current server is available or not - perhaps show those workspace(s) as greyed out or non-available, disable or close the tabs