if you still have this problem, here’s a couple of debugging tips:
Find the Folder where your start-up information is logged. On my box this is: C:\Users\zthom\AppData\Local\Sony\Vegas Pro\13.0
where you need to replace “zthom” with your username. Also replace “13.0” with your version – “12.0” ?
In that folder there are two files of interest:
FileExplorer.log This contains a line for each startup. For example:
======== 1/11/2015 12:22:22 PM: Created Window Successfully
======== 1/13/2015 12:00:55 AM: Created Window Successfully
The above are successful startups, perhaps yours has some error information there?
IF there are reports of problems there look at file FileExplorer.settings . Whatever you do don’t edit/change this, perhaps copy it to another file. Then have a look. On my box this contains:
<?xml version="1.0" encoding="utf-8"?>
Your file should look much the same except should be different.
Check that it is not pointing to a device that is no longer on your system (perhaps you used and then removed a USB drive).