[GREENFOOT-831] Scenario does not compile/not react without reason

In classroom I often encounter the problem that the scenario greys out and no interaction with the editor is possible (windows still can be switched, but also no reaction on clicking the reset or act-button). You have to quit Greenfoot completely/restart, then the scenario is working again. As far as I can see there is no particular reason for this behavior (like errors in the code).

The problem is concerning Windows 10 with 3.5.3, Stride.

Some weeks ago I gave a lesson for other teachers, also Windows 10 with (I hope I remember well) 3.5.4, Stride. Same problems.

At home I am working with Mac (no problems), so excuse me being not very specific in my description of the errors (in lessons I am running around helping students, so I am distracting from analyzing the bugs).

As I have encountered this problems in two different locations I am sure that this is nothing specific to your school-network or anything.

I am marking this bug as "high", because such bugs are very, very frustrating. The teachers I have been interacting came to the conclusion "Greenfoot is a buggy amateur-tool", my pupils get angry when they don't know if the world is not compiling because of their own fault or because the software doesn't work correctly.

Issue metadata

Issue type: Bug
Priority: Medium