I have not - but I will (I was just trying to follow protocol and make sure there wasn't something obvious I may have missed).
It is a fairly recent launch for a contract that was signed before Kentico 8 was released. So, upgrading to Kentico 10 may fix the problem entirely, but it isn't currently being negotiated.
As far as browser caching, those screenshots were taken from my machine. It is also showing in Firefox. IE is working as intended, though, obviously.
I will contact support and see what they say.
Thank you for your input!