Marketo Support is wrong on this one. It might not be officially supported, but it works very reliably in every (20+) instance I've done it in.
I use a combination of placing tokens directly into the HTML template of the landing page as well as putting tokens into WYSIWYG elements through the landing page editors.
This page contains both, without your ASCII problem:
- On that page, here's a directly-embedded token into the HTML template: "<script src="http://etumos.com/mkto/js/marketo-lp.js"></script>"
- That page also has WYSIWYG tokens such as the Form title: "We'll email it to you!"
A thought regarding ASCII—are those text tokens or rich text tokens? If you're copying and pasting the HTML into the WYSIWYG (aka rich text token), it can convert the HTML into ACSII.
Best,
Edward Unthank | Founder, Etumos