No known issue I'm aware of.
There are enough IE users left that it would be posted here somewhere if it were an issue.
"All of a sudden" things like this are indicative of something changing - the website or an antivirus program/definitions update - and it's usually the update.
As with the frequent occurrences with Avast Antivirus, I suspect what you are seeing is a Norton false positive.
There were IE exploits similar to what you seem to point to in the screenshots above in the wild many years ago, but from what I can see, having DEP turned on in the OS mitigated many of them, and IE versions 8 and up were mostly immune.
I suspect Norton is filtering the incoming data stream, either false flagging on something it thinks is a heap spray attack, or it's borderline possible that some rogue ad on eBay actually contains a decade old IE attack (very unlikely).
Problem here is that you don't know where it is happening, so you need to do more experimenting. Does Norton throw up a warning or are you finding it when you go check Norton logs? A true test would be to flush cookies and cache in IE, only open eBay page(s), and use it and/orlet it sit for a day or whatever to see if Norton flags anything.
