Created attachment 293 [details] Model provocating the error Even though a warning is produced, the engine accepts the attached model, and produces erroneous results. It seems that urgency is enforced on all edges, even though it is only present on one - which is not enabled due to a guard. (Has been fixed in development branch stratego_2016_ndiscrete)
Uppaal 4.1.19 implements urgency on all edges. Stratego 4.1.20-4 does not.