If you’ve already tried this please forgive me, but on the issue of resizing individual parts of a text element, you can’t do this by selecting part of the text in the Inspector, you have to select part of the text in the Canvas.
Regarding glitches in your exports, I have had similar issues, but they have all been solved by exporting with quality set to “Normal” rather than “Best”. I know… you always want the best quality, but I haven’t yet been disappointed with “Normal”.
Of course, Motion has a lot of other problems in my opinion, but I still love it.
Will
Will Eccleston
Kinetiscape Films