When I click on a slide it disappears?

I am trying to work on my mac with captivate. I've been working on a PC up until now. On my mac, the slide does not appear centered when clicked in the film strip. Then, when I try to click on it, it disappears. The properties tab allows me to go to the fluid boxes within the slide but I can't see them. When I click out of it and back to the slide it reappears... Hopefully that explanation makes sense. Thanks!