I'm working on re-coloring a logo for my company. Preview shows the logo perfectly. When I open it in AI, all the letters have lines and cuts through them that I can't remove. When I attempt to send individual letters to the back, they will disappear momentarily. If I change another letter, they will come back. This is only happening on my computer. Other co-workers can open the file and it looks perfect. I've attached an image file of it. Any ideas?