Thanks, this appears to be a problem between the window size that Squeak thinks the screen is, versus the size that open/GL thinks the size is. I had made some changes earlier this summer to handle resizing (manually). Obviously this crash gets triggered by Moom which doesn't follow the manual resize use pattern. 

On Sun, Jul 3, 2016 at 5:36 AM, Bernhard Pieber <> wrote:
Dear VM developers,

I can reliably crash the latest stable using the Squeak5.1-15113.image when I resize it with Moom ( right after starting the image. I tried to reproduce it by resizing it manually without Moom. I *think* it happened occasionally when resizing manually, but I could not reproduce it today.

Versions up to r3427 do not crash. The crash happens starting with version r3602.

With the latest unstable version 201606301459 built by Travis the crash still happens.

I attach the crash dump for version r3732. Maybe it is helpful.

Thanks for all your work!


John M. McIntosh. Corporate Smalltalk Consulting Ltd