New to forum, my apologies if this topic is handled in depth elsewhere. I have on several occasions experienced a crash (sorry, more specifically "InDesign has stopped working and needs to close" - that's a crash I think) when moving pages between different InDesign documents (some were converted from CS3, but saved as CS6 files first). It seems to happen only betwixt select files. I have avoided a crash by moving even numbers of pages - but not always. Perhaps I am unaware of some document/spread shuffle setting? Or perhaps this is a more commonplace problem? If so, how did you resolve it? Any guidance is extremely welcome.
Do you still have the CS3 installed? Most people here would recommend that you Export the file from CS3 as an .inx file and Open that with CS6. This can remove a lot of crud from the file and make working with legacy files easier.