Just installed update #4 on a machine also running Vegas Pro 14 Suite. This leads to multiple error windows "BCC Error: Could not load library ..." in HitFilm (BCC plugin are not working in HitFilm anyway because the license restricts the use to Vegas). This already happend with the original install and can be fixed by uninstalling BCC, deleting several folders and reinstalling BCC (Google found that for me).
But there is another issue: When loading a project with masks tracked by Mocha I get the message "This project file uses a plugin that cannot be found...". The Mocha effect (and all the work I put into the tracking and the masks) is gone in the project. A project created from scratch with Mocha loads without problems.
Any help is appreciated. Now I'll try to go back to the previous version...
Update: Downgraded to Update #3 and the projects work correctly. So there must a difference between the two versions.