It turned out that this was not the solution to my problem, however, I think I may have stumbled across something else that, in my case, seems to be the solution, at least for now.
It could even be my fault
I've been changing my post setup quite a bit, as I learn how to make it better. The Onecnc shutdown problem seems to be related to opening a previous (older) xfa file, and in my case, the settings for things like my drill cycles have changed due to my editing of my post. The drill cycles area is one area of your post that does overlap into the tool wizard, because the relevant parameters, as you know, have to be inquired about when you are setting up a drilling cycle (as an example) .
It is my theory that changing my post causes a corruption of the ncGlobal_inch.bin file when an older file is opened when my post was different than it is now. Theoretically, this could potentially be a problem if you switch between various machine posts, especially if the posts are quite radically different from each other.
Anyways, the solution for me is to delete the ncGlobal_inch.bin file and this lets Onecnc start making a fresh new copy. This file holds copies of your previous selected tool/material settings, and is there basically for your convenience. Deleting it does not destroy your inch or metric tool library.
If I err in my theory, corrections can be posted as necessary. I will not be offended