I had too the same sharing violation issue.
Steinberg has older version 6.11.10.2272 of elicenser downloadable at https://download.steinberg.net/downloads/Archive/eLC_6.11.10.272/eLicenserControlSetup.exe
I uninstalled ver 6.12 and reinstalled ver 6.11 of elicenser, did a maintenance scan, and now Cakewalk can save my project without sharing violation.
This is a temporary solution, but now I can use Halion SE in cakewalk projets without issue.
Cheers, and thank you all for your help !
Marc.