With SU 6, there were some problems with certain images inserted in Mac not showing up on PC (this was due some RGB channel and EXIF info issue) but even those didn't crash the app just the images didn't show (I think it's been fixed in SU 7). Other than that, I haven't had experiences with such behaviour either (although you never know).

yes... thank you. All very good points also!

Hi Dennis, It should be Flash IMO. That's the most cross-platform and cross-browser format and its embedding routine is also straightforward. Sure you could also try to embed QT asmost PC users have a plugin for that.