Just to say - we probably have different versions of Memory Map - but I don't have a 'profile' button, nor any menu option to 'show profile'.
The only way I know, to see a profile, is to right-click on a Track or Route. If its a Route, I can then simply select 'Profile' from the pop-up menu. If its a Track, then its 'Profiles' and then either 'Elev' or 'GPS'.
Is it this right-click functionality that has disappeared?
BTW you can save out all your plotted routes, as a single file if you wish, using menu Overlay, Export All.
This is just like doing a 'Save As'. Then you could, if you needed to, reinstall and simply Overlay, Import to get your routes back.