2016-09-21 12:11 GMT+02:00 Guille Polito <guillermopolito@gmail.com>:

I'm still taking a look at what would cause this. And I also think we still have this bug in pharo 6 (and thus pharo 5) because I found it lately very often.

In the meantime, if you find that your image is causing you these problems, you can workaround it by executing:

UIManager default spawnNewProcess.

But be careful. It could lead to multiple UI processes which will cause strange things on screen.