Recently I have been having a small issue, nothing serious (I hope not) I am just curious if anyone knows what it is. So basically sometimes when I view DA, such as the "more like" pages, a sizable white rectangle will appear in the upper left corner of my screen and then disappear an instant later. I am using Chrome and have used it to view DA for quite a while now, never had this happen till recently with the addition of the "more like" function to every deviation.

Anyone know what that rectangle is?