I tried that beta, and had the same issue as before. I looked into it, there is document, and it has documentElement on it, but that documentElement did not have appendChild defined. So, I assigned an empty function to appendChild on that documentElement, and it actually progressed past where it would usually crash. But then it stopped with the following message.
ScriptEngine::evalString script src/project.dev.js, failed!
ERROR: TypeError: element.setAttributeNS is not a function. (In 'element.setAttributeNS(null, p.replace(reg, "$1-$2").toLowerCase(), attributes[p])', 'element.setAttributeNS' is undefined), location: src/project.dev.js:5803:57
STACK:
_createSVG@src/project.dev.js:5803:57
src/project.dev.js:5812:32
I did just try completely removing CSSPlugin from TweenMax a little less than an hour ago, and that did indeed work. I just hadn't had a chance to post my results yet!
I really appreciate the work you put into this! I'm good, but I'm more than willing to help if you want to work through to a less dire solution.
Please let me know, and thanks again for the help!