If you open a Dynamo project that is based on a language that is not the same language as the Revit project you are in it can cause Revit/Dynamo to crash. We can avoid the crash if we open a project that shares the same language first. That's how it was described to me at RTC in Dublin this past week. Perhaps it is just a build incompatibility? It seems to me that will make it difficult to mix and match up Dynamo work that is done in various languages?
The best place to stay in the loop about Dynamo info is DynamoBim.org. Better check in with the forum there to be sure.
BTW, regarding forums, AUGI recently created a new forum for Dynamo, to expand their Revit forums to include a place for this rapidly emerging tool. You can VISIT it HERE.