I have the same problem: the tab appears but is empty. Version 2.8.4.
The configuration from the SIM examples works.
By the way, it installs on 2.9.4 without any problems, but... there are other latency issues that I also can't solve.
I got the files for 2.8.4 from here
github.com/andypugh/LatheMacros/releases/tag/v2.0
And for 2.9.4 from /3.1
I put everything in the machine's configuration folder
And added the EMBED_TAB.... lines from your lathe_macros.ini to my .ini file.
What am I doing wrong?