I see that wackybee has solved their issue of blank slides, but i've also started noticing blank slides in my preview screens with my current Cap6 project. If I should start a different thread, let me know!
My issue only happens on three or four slides - and there doesn't appear to be any outstanding reason as to why those four slides. I get the title of the slide, the page number, and the fwd/back buttons at the bottom, but no image or text in the main area of the slide. I believe at least three of the four have advanced actions to show hidden text captions, but it may only be two of the four. I was fine until last week so I'm not sure if it's a change I made or what. I've cleared my cache and forced republish on all slides to try to resolve it but that's all I've had a chance to do.