Hello,
I have a master license as well and just upgraded to Ubuntu 18.04 / Ubuntu Studio 18.04 on my home PCs and licensing disappeared for me as well. I have had issues with updates "de-licensing" me in the past also. When I downloaded an unlock file in the past for MC24, it only worked on one PC, so I have to use a separate restore for each of my home PCs. I'm getting concerned I am not going to be able to unlock all my systems if this keeps up. Oddly MediaCenter 23 still opens fine even after the upgrade.
Please advise.
Thanks!
Jason