When I try to open and edit slideshows in LibreOffice Impress, they often (more often than not) don't display or let me edit them.

At first I thought I was just doing something silly with the 'view' settings, but I've switched through all possible options and the slides still won't display. The tool menus are also playing up, too - when I try to move them around they often leave ghosts on the screen which I can only get rid of by restarting the program.

Any ideas on either how to fix this, or which programs I might use instead?