I logged this as R-37019. I can make the crash happen.

For the record, we have R-28900 in the system to address the issue when using a bull mill.

The coolant turning on and off for each hole was an issue discovered in Mastercam 2022 and subsequently corrected in Mastercam 2023.

Tried editing my signature to avoid confusion but it doesn't seem to be working. Maybe I'll get it figured out about the same time as the red lines.

I've been investigating what makes the red hole axis lines display for a few days now. I have seen it but can't reliably reproduce it. If you know of a process that gets them to show I'd but happy to hear it. They are supposed to be blanked and are necessary for the toolpath, I just can't figure out what is causing them to display. Once I figure out the steps I can get the issue logged for the development team to take a look at. You can post it here or email [email protected] and I'll get it. Thanks.

Generally, yes, send enhancements  to QC or use the Mastercam forum. This one was brought to my attention so I logged R-28639 to see what we can do about it.

This is definitely a defect. Since you are only after the wireframe arcs, I would suggest using the Mask on Arc option in the Toolpath Hole Definition panel. Another option is to use the Select Only quick mask instead of Select All. That one seems to work fine.