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	ID	Project	Category	Task Type	Severity	Summary	Status		Opened by
	2724	QCAD Bugtracker	QCAD/CAM	Bug Report	Low	QCAD/CAM QT6 Freeze during CAM EXPORT.	Assigned		Mgoodboy	Task Description Versions QT6 3.32.8.0, 3.32.9.0 on WIN10 and LINUX Ubuntu 25.10 (don’t work in WIN7) Versions QT5 OK on WIN7, WIN10 and LINUX My PlanetCNCW64 software accepts G41/42 but gave an error on generated g-code G40 (“Arc without IJK or R is not valid” G40 X85.6 Y62.24 Their bug?). So, I had to fill “Interpolate axes with line segments” in CAM Configuration. A little window QCAD CAM “Regenerating tool path…” opens, shows 50% all the time, and a button “Abort” that closes that window when clicked, but doesn’t stop the process; a lot of messages “regenerating tool paths…” run at the bottom with great speed, as expected. With QT6 but not QT5, after a while, these messages start slowing more and more, when I believe the arc segments are being generated, but keep a normal speed on lines, till the program freezes. During this process, with both QT6 and QT5, the memory used is growing, but is not released until the program is closed. Garbage collection problem?

QCAD Bugtracker

QCAD/CAM

Bug Report

Low

QCAD/CAM QT6 Freeze during CAM EXPORT.

Assigned

Mgoodboy

Task Description

Versions QT6 3.32.8.0, 3.32.9.0 on WIN10 and LINUX Ubuntu 25.10 (don’t work in WIN7)

Versions QT5 OK on WIN7, WIN10 and LINUX

My PlanetCNCW64 software accepts G41/42 but gave an error on generated g-code G40 (“Arc without IJK or R is not valid” G40 X85.6 Y62.24 Their bug?). So, I had to fill “Interpolate axes with line segments” in CAM Configuration. A little window QCAD CAM “Regenerating tool path…” opens, shows 50% all the time, and a button “Abort” that closes that window when clicked, but doesn’t stop the process; a lot of messages “regenerating tool paths…” run at the bottom with great speed, as expected.

With QT6 but not QT5, after a while, these messages start slowing more and more, when I believe the arc segments are being generated, but keep a normal speed on lines, till the program freezes. During this process, with both QT6 and QT5, the memory used is growing, but is not released until the program is closed. Garbage collection problem?

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