@60hz I replied in the bug report, but basically the event loop handling is supposed to be much more stable and improved on modern macos with 8.6.11 from my understanding. For instance, 8.6.10 required patching to get the scrollbars to show up on newer osx (also this is why there are 2 different releases for osx on miller's site I think). The patch was kind of hacked out of 8.6.11 which changed the architecture of its event handling since 8.6.10.
I noticed the bug you mentioned in an earlier release with tk 8.6.10, and the fix was actually merged into main pd vanilla. I cannot reproduce on osx 10.14.6 so unfortunately I'm not sure how to go about fixing it..
as for the ceammc bug, it is an issue with tk 8.6.11 with the ttk "alt" theme and has to be fixed in either ceammc or tk.
However you can still package w/8.6.10, I suppose I can upload a version using it instead if it makes that big of a difference..