Hiya,
So I was browsing the bugs forum (yes I know, I was bored), and came across this report here: viewtopic.php?f=2&t=60016
The general gist is if you click "join game" on a surrendered position, you should get a confirmation message so you don't accidentally wander into a hopeless situation. However if you click with the middle button to open it in a new tab in Chrome, this confirmation message is bypassed and you join straight away. The suggested fix by SuperDipsy was to disable middle mouse interaction with this button to stop this.
So as I was rather bored I went and tested whether it still happens, and it still does! When i click with my middle mouse, I am instantly put in the game with no warning message appearing. It also doesn't open it in a new tab, which is the whole point of a middle mouse click!
I thought I would raise this issue again, as I imagine it would be a relatively quick one to fix (says the person with little coding experience!). If it has been decided not to be fixed, or would be a lot more effort than it is worth, let this post be a warning to people: DO NOT USE MIDDLE MOUSE CLICKS ON "JOIN GAME" BUTTONS!!
Thanks,
Jakofipa