Strange indeed ! Again, I’m not very experienced with standalone players, but it’s true that there are so many formats around that you almost need to check the manual to verify which are supported on your particular model. Generally speaking, Video-CD (VCD) and Super Video-CD (SVCD) go back to the pre-DVD era and are not used that often any more. SVCD is better quality (like DVD), but less compatible than VCD (which may have been your problem here). If the software allows it, I’d burn a slideshow as Video-DVD onto RW first (and then burn or copy to R if it works and you wish to keep it). Your choice for +R/RW or -R/RW can depend on what your burner/player(s) prefer. Always use quality blank DVD’s, Verbatim is normally a safe bet here).