I can't figure out why there are these little plus signs. When I add a new port, a smal text box is displayed that looks like those auto type boxes that is shown in Visual studio from which I can choose something already created.
These plusses seems to appear if I change the port name in that box. But why, and how do I shut it off? And what do they mean?
This I did not have while using 32-bit Eclipse, there must be some setting I have missed.
The "+" (Or -, ~, #) are the visibility marker. "+" means "Public".
No icon means "Undefined visibility". But it is not clear in the UML Specification what this means exactly. So, for "Public" elements, you can have either no overlay (The visibility has never been set), or the green "+" overlay (The visibility has explicitly been set to public)