Powerclip leaving an 'X' after extracting contents?

I just upgraded to X6 (32bit on vista).  I use the powerclip feature a lot and have noticed that when I open a graphic I put together in a previous version (usually X5), if I have an object that has a powerclip and I extract the contents and delete them just to leave the original shape (that was the container).  That shape that's left has an 'X' across it that I can't get rid of?  I can even see it in the wireframe view.  I tried the virtual segment delete tool to try to eliminate the lines but it didn't seem to do anything.  I was just wondering if anyone else had run in to this or might know how to correct it (or if I'm totally missing something new?).  :)  

Thanks in advance for your help.