stack size of jqt.exe is set using /stack parameters during linking. https://github.com/jsoftware/qtide/blob/master/main/main.pro
it is already 10000000 same as that of jconsole.exe by StackReserveSize inside vs project https://github.com/jsoftware/jsource/blob/master/makevs/jconsole/jconsole.vcxproj.template Not sure why it crashed in jqt.exe but not jconsole.exe, but you may try increase stack size during building jqt.exe ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
