A box is appearing in the lower r.h corner of my screen saying "Navigation to the webpage was cancelled," and there is a logo of the lower case letter "i" on a blue background. Below the message it says "What you can try:" and the only option offered is to "refresh the page", which never seems to do anything. The block is blocking the bottom of my normal screen slider bar and I can't figure out where it came from. This problem started about 2 or 3 months ago.