What are you using for the presentation? Are these images being used in Microsoft Powerpoint?
Or are you using the SlideShow feature in Photoshop for the presentation?
Also, did you save the pictures as you placed captions on them or did you encounter the error before trying to save the pictures? Photoshop saves pictures in a different format by default when you save them from within the program. This format may be incompatible with other presentation programs, this is why I asked the previous questions. I see you are currently unavailable. I will check back soon for a response - Thanks! Dr Bell.