Using IE 11 and Win 8.1 on two different computers, both exhibit the same behavior. With the 1Password browser extension enabled, pressing the "back arrow" will only go as far as the top level page for the current URL but won't go to a previous URL. For example, if I open a browser to my Google home page and then go to nytimes.com and then click on a link within that site and then click the back button, the nytimes home page will appear. If I click a second time (or a third etc.) the browser stays on the nytimes home page and doesn't return to the original (Google) page. When I disable the 1Password add-in, IE works as it should. Re-enabling the add-in and I get this same behavior where the back button works only to the home page of a given site and then gets "stuck" there.