Error in tool_offsetview.py

Yes, I use master. This solution using time.sleep(1.5) works very well. Maybe it will be useful to someone until the problem you are reporting on is resolved.  

I just pushed a commit that should take care of this race condition. Feel free to remove the sleeps you've added to the handler, etc. and give it a try. Let me know if you see any issues.

Yes, now after updating to the latest version it works properly, without the need to delay GUI loading.

There is one more problem in gtdragon, possibly unrelated to the above problem. The 50% and 100% buttons next to the spindle speed slider do not work. I also checked version 2.9.1 running from the ISO installer and the same problem occurs.

I pushed the fix to 2.9 - there is a conflict in master so I can't move it to there yet.

The two action button's property 'joint_number' needs to be set to 0 instead of -1

Hi Chris.

I noticed that when I press the "go to sensor" button in the "offsets" tab
the entire screen is frozen, you can't see the speed or position progress in DRO. (in qtdragon, of course).
I corrected two lines in the handler file in the "btn_goto_sensor_clicked" function and it works fine.
Can you check if this is correct and make corrections if necessary?
Changes in the screenshot.

Yes I think that change is fine - I'll do some more testing though.