12.1.1 gets stuck on start up while trying to locate missing media - does not go to "link previews"
This is a new bug: when I launch a Premiere Pro project that has missing media files in it that need to be located, Premiere gets stuck on the "Locating Media" window - forever. I have to manually cancel the process, only then does Premiere proceed to the "Links Previews" window, where I can manually locate the missing media files.
If you can reproduce the behavior in a current build, please contact Support.
Just a thought, i had something similar happen to me. Try to be sure you are logged into your network drives if you have ever used them or stored your project on them.