ok, are your all your software components in sync?
at one of the projects I'm working on, they have installed Personas on DEV for example... and not (yet) on the rest of the landscape
that already results in issues when transporting, but other than that there's no harm (for us)
could be that you have some componen installed on DEV which does make a fuss about how you call the program or how you address variables from/to memory (should you use that)