On my system sometimes Halion 5 crashes Logic when loading a project. Then I move the Halion AU-Plugin from Library/Audio/plug-Ins/Components to the desktop, start Logic and rescan all PlugIns, quit Logic, move the AU-Plugin back, run the “VST AU patcher” and everything runs fine for some days. On this occasion I also check for the latest version of the eLicenser-ControlCenter.