Special Characters Work In "Properties" but not when editing within a diagram.
A class attribute (or relationship label) with, for instance, a dash is not accepted when editing within a diagram. However, the same works within the "Properties" window on the right. (Also, when trying to remove a relationship label within the diagram by deleting the text which was currently there, it is not possible within the diagram and is possible within the "Properties".)
This is still a problem. The workaround makes it less of an issue but it would be nice being able to directly enter "special" characters, like - ( ) etc.
Sean Grimes commented
This is still a problem.