Hi RBartlett2, it is probably a media problem, not related to CloneDVD.
If you use low quality/cheap media, you get high error rates that some readers are not able to correct without freezes, skips, pixelation, etc...
What kind of media are you using? Princo maybe?
It could also depend on the reader's ability to play DVD-Rs (or DVD+Rs)... is it a standalone player or are you talking about your PC's DVD-ROM drive?