I'll give an update with a test case, might be a couple days I have a few hotfixes I need to implement beforehand.
Thanks for the prompt response! update: I found that including:
'draggable' : 'https://cdnjs.cloudflare.com/ajax/libs/gsap/1.17.0/utils/Draggable.min' // 1.17. 0
'TweenLite' : 'https://cdnjs.cloudflare.com/ajax/libs/gsap/1.17.0/TweenLite.min' //1.17.0
'cssPlugin' : 'https://cdnjs.cloudflare.com/ajax/libs/gsap/1.17.0/plugins/CSSPlugin.min' //1.17.0
had broken our inline modal editors(popups that appear in our editor window with buttons that change font-size, font-family, etc.. etc..) only in IE11 though(ie9 still worked?), chrome, firefox, and safari are all fine as well. I had to revert back to 1.15.0 on all 3 to fix this issue. Not sure if it's related to the issue above. I'll try to work this weekend or monday to mock up a simple test case with a similar scenario, until then have a good weekend and I hope my information helps you guys!