The second error breakpoint is:
here are a few things I have done to troiubleshoot this:
- Rename .region in the fitvids config area to something random like .regionxyz -- error goes away but obviously videos do not resize anymore.
- Try plain vanilla Bartik default theme. -- still the same error so this rules out there's anything funky going on with my theme.
- Found this issue for fitvids: https://github.com/davatron5000/FitVids.js/issues/26 and an associated JSFiddle where you can see the error happen (note you should probably have script debugging turned on in IE 9)
Note that changing to IE8 makes the error go away so it seems very specific to IE9.