Alwin, multiple PCs and users and reformatting and everything else we have done above has already ruled that out.

I have no problem waiting. Most of the time the users get a black screen crash there is no log. The RPT just stops, and users are forced to logoff or do a hard reset.

re-installing Arma3 - No Change
relocate your game data file to another folder or SSD (I have one) - No change
uninstall another unusable or old games, programms and files to release some more space (I reformatted with just Arma and its dependencies) - No change

Arma 3 memory usage at crash always below 2.5GB, so not a mem leak.

Tried Both the Performance 1.66 exe on Server and Client Side. No Change. It does seem linked to just Abeloth. Also tried disabling all BE filters, and setting MaxCustomFileSize = 0. No change. I'm on Dwarden's Discord now.

I now have another friend who is having the issue on Windows 7 64bit.

@Jawsh, I have tried all the solutions one by one that you linked. No Change. As I stated in the bug, this is for multiplayer only.