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i cannot replicate, i get the value stored in both the var and the ui even through multiple restarts it remains correct.

I blame things I can't say but also the things I can't say with their fascination with American culture.
If you can't laugh at yourself you're coward.

Okay, good deal.  Glad it's working for you.

Thanks for the response. I am getting the line you asked about in the terminal. When I just tried using the space bar pause, it worked in all but one instance. I think you're right, it's a focus issue. In one instance, I had clicked the coolant button and then hit the space bar and the program failed to pause, but I was unable to replicate the behavior in the short session I had to test it this evening. I'll follow up if I'm able to reproduce the failure to pause.

But anyways, thanks for the help with this! I hadn't realized how much I use this feature until I didn't have it. When the tool is plunging rapidly, it's really nice being able to reflexively pause everything to check positions and the distance to go.

If you run linuxcnc from a terminal, do you see this text?
'Custom subclassed handler loaded for spacebar pause'

sometimes it's a focus problem, try pressing the 'G54' or 'ABS' button (after the program is started.). If that works I will look into why you need to do that.

I was able to reproduce this error with a simple test setup
with no mechanics and using g76. It also causes errors even
at a constant spindle speed, as the offset changes with thread
depth over the multiple threading passes which would cause
a  wider than expected cut.

To test this I setup a 7I96S with a stepgen spindle setup to
emulate a 8 count encoder with index (using the stepgen table mode)

I checked the offset by using the sum2 component to scale the spindle
rotations to the thread pitch and subtract the result. This offset
should be independent of spindle speed, X,Z motion constraints
and drive line distance to thread pass, but it is not.

Have you raised an issue on the LinuxCNC github page?