When I want to make a word or phrase of text bold or in italics, you first have to use your mouse to "shade"" (highlight) the words you want to alter. But when I try to "shade" the words, then I have to release the mouse control, the "shading" (highlighting) of the text disappears. Then I cannot change text into bold or italics. What is proposed? I tried two different mouses with the same result.