Since I updated the latest and greatest version I have had nothing but problems.  Intermittently I am experiencing a host of different issues such as:  cannot always clear drawing,  cannot undo last step,  when drawing a circle (for example) part of the circle disappears and when I try to fill in the missing area I sometime lose the rest of the drawing.  The application does eventually crash and I lose whatever I had been drawing.  What used to be a 5 star reliable and fun app is now terrible.   Are there known issues for everyone,  how can we fix this?  Help