I can enter urls into the address bar with no problems, but when entering data into different fields (i.e., a search on Wikipedia, commenting on Facebook) I sometimes find that when I hit Enter/Submit/etc, the browser does not respond. It's an intermittent problem, sometimes the app runs smoothly without a hitch. I've tried refreshing the page, but it doesn't help. I've found that force stopping the application and starting again usually resolves the problem, but it's irritating.