[Mark Barton]

To get it to work, I had to use the serial number provided by Sony for both the install and when launching NewBlue Titler Pro as a plugin within Vegas. If you try to launch the Titler from the Windows Start menu before you activate it within Sony Vegas, then that is when I got that error that would not accept the serial number Sony provided.

[Mark Barton]

I just tried and initially had the same problem. I re-read the help file and noticed I was trying a Video Plug-in. Right click the media or video event and choose “Media FX” and that is where it allowed me to click Apply.

[Mark Barton]

https://www.sonycreativesoftware.com/3DTitler

There is a video at this link that gives an overview.