Hello,
before running a slideshow please go to the Options then Slideshow. The click the Select button. Go to the end of the list and uncheck all the transitions that start with [3D]. It should be OK.
Or you can download this file:
http://www.nabocorp.com/cam2pc/no_3D.zip. It contains a registry patch that will automatically disable all the 3D transitions. Make sure to close cam2pc before applying this.
Regards,
nabocorp