Joe,
I've tried SVN on stencyl still now.
I've experiment some problems not only in Scene creation but in any numeric id object (Actors, Behaviors, global attributes, ...).
For example creating scene behavior at the same time in two different stencyl will create a same id behavior. Both are present in snipper folder but only one is visible because game.xml show only one of them.
Work at same time at same project is very very difficult. Only way I've found is to create a set of resources dedicated to single developer.
Example:
Actor001Dav
Actor002Dav
Actor003Dav
Actor001Ste
Actor002Ste
Actor003Ste
Actor001Ric
Actor002Ric
Actor003Ric
Only David can rename and use David's Actors and only Stephane can rename and use Stephane's Actors. And so on.
This must be extended also on Scenes, Behaviors, Game Attributes, ...
Particular attention must be used in code mode behaviors.
Anyone find some other ways to use SVN?