Hi! No I did not run a Windows update. It is possible that Microsoft Security Essentials was updated though. It does not happen at every MSE virus definition update, but perhaps it happens when MSE is updated itself.
I don't understand what you mean with "saying it's not fixed in 2 years is incorrect". I understand that you are continuously working with improving the software and that's great. However, I got this issue now and it appears to have been reported 2 years ago. It's strange that you haven't been able to replicate it.
Anyways, I'm intending on upgrading to Win 10 soon and I expect this won't be happening anymore after that. It's only been reported on Win 7 right?