Phil, I’ve experienced the same and noticed it only works when running as IE9 or IE10 (compatibility meta tag). I’m running IE11 and noticed my master page was running the IE8 compatibility tag so I created a copy of the master and changed the tag to IE10.
Thanks for this Chris, I have an intranet site on the same SharePoint that I tried to do this with there along with the Edge tag as I wanted it to be a little responsive. However, it messed lots of things up. For example, if you try to use a people picker field, unless you get the name first time, you can’t select a name.
Also, the data picker field wouldn’t work as it was supposed to.
Do you experience any issues like this with the IE10 tag?