We have yet to hear about a problem with InDesign CS3 on Leopard from users who can confirm they’ve done a clean reformat and install with Leopard. I’ve had numerous reports from individuals who have done a reformat and clean install of Leopard that InDesign CS3 runs without any problems.
If you’ve done a clean install of Leopard and experience any stability problems running InDesign CS3, please report them on the Adobe website and tell us exactly how you installed Leopard.
The error message about InDesign encountering a serious error and shutting down may be due to the method used to install Leopard. There may be problems caused by using the archive and install process, in contrast to doing a completely clean installation, so detailed input from users encountering problems is important to help isolate the cause(s).