This is mostly an informative.

I accidently clicked Suspend instead of Show graphics. I quickly started it again, but that model didn't restart.
And the graphics wouldn't run for that model.
There was a message that it was paused and removed from memory. So I ticked Suspend in the File menu, and then Run, and the model started.

Could be tricky if you're not careful, with Show graphics being adjacent to Suspend.

And if you view the graphs with w, and leave them there when you close the window, the next time you look it will be 'washed out'.
Just press w twice, and it will be OK. Until the next time.

Les