We have received a very small number of reports of the loading bar getting stuck while booting up Macs/MacBooks after installing Focusrite Control, Scarlett MixControl, Saffire MixControl, RedNet Control or Novation Editors/Librarians on machines running High Sierra (10.13) and Mojave (10.14). In these instances, reinstalling the operating system and then reinstalling our software has resulted in no problems whatsoever.
At present we are not aware of anything that's specific to our software that would be likely to cause problems like this so we are liaising with Apple to try to understand the root cause of the issue.
We will update this article as soon as we have any further information. In the meantime if you do experience any problems please Contact Technical Support.