Okay, so, this is a bug I’ve actually reported before(albeit under slightly different circumstances!), but to keep this short and sweet, I just recently tried to change the shortcut for the “Screenshot” function-F12 is the wireless on/off button on my computer…but, unfortunately, once the overlay loaded, I could neither click on any of the options, nor could I Shift+Tab back out of the overlay. The clock still worked, and I was able to close the game normally, but this is still a somewhat annoying problem, and I was wondering how many others have had to deal with this same issue… 
Post-Script to Devs: Is this problem mainly related to Automation, or could a flaw with Steam itself be the issue?