thanks for your concern. I'm using Sonar X3c.
This problem happens when I try to assign an envelope to a different parameter. Sometimes it seems that I can't assign it to any VST fx parameters, only to Prochannel and track parameters such as volume and pan.
I infer from your response that you haven't encountered this issue. Since I have only noticed this problem in a project which I began in Sonar 8.3, I imagine it's not a very common issue. I was hoping that perhaps someone else had come across trouble trying to reassign an envelope, and might have a workaround or some theory about the cause of the problem.
There is a similar problem I've seen where setting the color of a bus on a project from X2 doesn't set the color on its associated tracks. I imagine these are issue with the new features - the bus/track color setting didn't exist before X3, and I suppose the changes to automation introduced in X1 may have interfered a bit with backwards compatibility.
Perhaps someone else has an issue with reassigning envelopes. If so, what have you done to work around it? I will have to do some tinkering to figure out exactly under what circumstances this is happening.