1) ASSERT: make sure you have a local forge runtime installed on your harddrive and added in the forge preferences
2) ASSERT: make sure forge tooling is running on local runtime
3) ASSERT: make sure you have the Forge view opened and forge running
4) EXEC: in the forge preferences hit Edit but dont change anything. Simply hit "OK" and close your preferences
Result:
Once you get back from preferences the forge view is not responding. You cannot enter any input and the Stop button is not responding either.
5) EXEC: close the forge view and reopen it:
Result:
The forge view is telling you that the forge runtime is not running:
It pretty much looks like as if editing the runtime kills the runtime without the view noticing it.