I found another possibility. I was hanging up on loading right at the “Creating windows…” phase. Startup would continue about 30 seconds later.
Not long ago I uninstalled an OFX plugin NewBlue titler. I noticed that some of the plug-in names remained in the list of Video FX. After some hunting I found the folder “C:\Program Files\Common Files\OFX\Plugins\NewBlue\”. I removed the NewBlue folder (just moved to my desktop to test). Started up the program multiple times and each time there was barely a delay at “Creating windows…”
My suspicion is NewBlue didn’t cleanly uninstall and Sony was looking for its pieces. I wish there was an easier way to manage plugins. I only found the folder by looking through logs in ” C:\Users\Kevin\AppData\Local\Sony\Movie Studio Platinum\13.0″. It doesn’t look like all plug-ins are located in the same place.