Since much of the innards of Dise has been completely rewritten with Dise 2010, when migrating from Dise 1.6 and Dise 2010 it is recommended to test the content to see that everything works as it's expected to. Dise 2010 has a backwards compatibility engine that will automatically convert older Dise Movies (.evs) to newer (.disemovie) on loading them.
Nonetheless, there are unfortunately some cases where some manual work is needed to get it to work.
If you discover any issues with backwards compatibility in your projects, please Contact support.