I just renewed my Kapersky subscription and upgraded the plan a bit (because it was on sale) and it has been interfering with random stuff.
Right now I'm trying to order my school books online and it's screwing with the website. It won't let me open a dropdown menu in the order options. When I have to sign in to the site it opens a little window and none of the buttons on the window work unless I disable Kapersky. And on the site where it shows my cart it has the # of items blacked out.
Top image is what it should show: