I could not customize when rendering final project to mpeg-1 (using Mainconcept encorder) of Vegas 5.0a build 134. (Click custom button - no custom dialog appear !!!)
i'm also experiencing the same exact problem and haven't found a solution yet...i've tried uninstallng and reinstalling vegas 5, but the custom dialog box still didn't appear...
Simple solution, render out to AVI and use TMPGEnc to encode, for mpeg-1 I think it's still free and in my humble opinion does a much better job of mpeg-1 than the MC encoder, well certainly on poor footage.
Do a search on this topic. You'll discover a registry entry that needs to be deleted and it will then work after that. To help in the search, try these keywords:
This is the reply to my post on SoCalVegasUser group (Yahoo). I had the same problem with V4
... This is a known issue. You have a registry key that is preventing the custom
button from working.
Look in your registry, and make sure it only has these entries, and nothing
else. I do remember that one additional entry has to be deleted. Back up the
branch (export) before you delete, so you can restore if things mess up.