This problem can occur if you have closed CPN Tools when it was minimized. This is a known bug which has been fixed from version 3.0.0 onwards, but may still occur if you remove monitors from your setup.

If you can see an icon for CPN Tools in the task bar, then just right click on the CPN Tools window in the task bar and select maximize. Then quit CPN Tools and start it again.

Why does the tool crash when I try to open a net?
Why can't I generate a state space for a timed net?

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