I have several questions for you, if you would please answer them for us:
1. Who is the manufacturer of the discs that are changed?
2. Did you use the Microstudio Duplicate Disc Tab, or the Custom Assembly Tab to make the disc copy?
3. What version of Microstudio are you running (click the Help menu, About Microstudio... command)?
4. Can you send us a disc copy that exhibits this problem?
5. In your computer, what is your processor type (Pentium II, III, AMD K6, Duron, Athelon, etc.) and what is the clock speed (350MHz, 600MHz, etc.)?
We don't ever remember having this problem reported, so we are interested in digging for the cause.