Hmmm, yeah – I reckon there’s an anomaly there. The background color you set in the Motion preferences is only visible if you set the Project prefs to show Solid rather than Transparent BG color (and you can’t set that as a default obviously) and then it’s going to affect your alpha channel as well. Whereas, as you say, when you set it in the Project prefs it shows up either way.
Good luck with your quest!
I have to say I’m intrigued to know why you want to set your background color to anything except black …? I’m sure you’ve got a good reason!
Simon Ubsdell
Director/Editor/Writer
http://www.tokyo-uk.com