Thanks for posting to the Community.
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Michael, we ended up changing all our html fields to plain text. There were a lot of windows to go through and then we also had to update notifications that had used the html formatting. This resolved the crashing. We did recently find that we had a group policy in place (something about IE tab growth) which forces IE 11 to run in 64bit mode. We turned that off so now IE is running in 32bit. This fixed several other IE related issues. I have yet to test html fields again but I intend to. Right now we are concentrating on finishing up our build for go-live.
I would be interested to hear any thoughts or insights you have.