Hi,
The remote engine option assumes that there is an independent UPPAAL server is started... anyway, it's unrelated.
I suspect, that the issue is the bug in license code related to unicode characters either in the computer name or user settings path (where UPPAAL stores the license information).
This issue has been fixed in UPPAAL-5.1.0-beta4.
Could you please try UPPAAL-5.1.0-beta5 instead?
UPPAAL-5 includes Stratego functionality, so your experience should be much better there.
Best regards,
Marius