@oppidum Thank you very much for your detailed bug report. I was able to replicate last night with IE11 on Win 10. I reached out to the devs and we were able to find a resolution.
We upgraded to a new version of the forums yesterday and it looks like the upgrade was incomplete, but was only affecting IE. It should now be resolved.
On another note, if you are concerned about security, maybe IE is not the best option for you. In the past there were a ton of exploits for IE, and while they are greatly reduced now, I’m sure there are plenty of bugs in there left to exploit. Especially if you are going to stay on an OS that is going to be EOL in a couple of years (January 2020). If you are still using it then, you won’t be getting any more security patches for IE and will be vulnerable to any 0-day drive by hacks that the bad guys have in store.
I would suggest Chrome, which has a great plugins ecosystem (AdBlockPlus to block the ads for example), and it auto updates pretty frequently. You also don’t have to worry about sites not working properly as much, as IE is one of the more finicky browsers and most developers use Chrome to develop.