All,
If you are using persistence with version 1.2.2 then if you have both roadblocks enabled for OPCOM and composition saving enabled in Database module, you will likely get stuck on the loading screen. You need to disable composition saving and restart your mission with a new name.
If you are not using OPCOM with roadblocks and composition saving and still having the issue, please run your mission with Database module debug on and post the RPT and ALiVEPlugin.log