This worked - although I don't understand why or how my drawing got that out of the standard view. The solution didn't work exactly as you described, but it led me to something that did. I haven't used that command before, so I tried some of the options after trying it as you specified. When I tried the 'world' option, the drawing regenerated and the tic marks were filled. Thanks for your answer, that something I NEVER would have thought of!