The following bug is still on the 2015 version.
When opening a drawing containing a iso message and double click that message I get the properties and not the edit message window. When I click the place new message and hit esc, then when I double click the message I get the right window.
It seems like the "script" is not loaded by default.
I cannot reprodcue this behavior. Even if I close the project, re-open it and the drawing, a double-click shows me always the message. Do you have installed SP1?
I want to confirm the described bug. It happens in our shop on 2 identical machines with the same set-up. I get the proper popup message depiction, the guy on the other machine gets properties. Don't see how this is an issue since I have only seen ISO message work one time on first instance of a message in the project. All the other iso message inserts just get ignored, and the one that initially worked and displayed the message, although much smaller than I expected, has now also stopped working. I just assume iso message to be a non-functional feature, kind of like blind flanges in P&ID.
We too are experiencing this issue. After placing the iso message everything works fine until closing completely out of the software. Save, close, and re-open the drawing or close and re-open the project and drawing and everything works ok. However, if I completely exit P3d and then re-launch it, open the project, and get into the drawing, double-clicking an iso message opens the properties dialog instead of the 'Create Iso Message' dialog.
A separate, but related issue is that moving an iso message in the model does not move the iso message on the drawing. The message on the drawing always stays where you initially placed it.
Iso messages need to be more robust as they are extemely useful.