This bug occurs when using the viewer with PerfectScreens (downloadable from http://www.softwareutilities.com) 1. Run the viewer 2. Switch to a different workspace with PerfectScreens, then switch back Boom A crash occurs in the nsWindow's WndProc - the WindowLong that stores the reference to the nsWindow appears to be valid. Whether this is PerfectScreen's fault or not is yet to be determined. Also, whether this bug appears with other virtual desktop utilities is yet to be determined.

beppe, please assign to a QA Contact to get some regression points here and testing with Apprunner. Thanks!

I downloaded the 'lite' beta version of PerfectScreens, using the 3/10 version of apprunner, and going from different screens does not crash the app. Nathan, can you try with the newest version of apprunner and see if you get the same results.

unable to reproduce.

marking as verified