This may be a dumb question, but after activating the Note command do you first click in the graphics area to activate the text box before clicking on the dimension?
Either way, it shouldn't be crashing. Have you reported this to your VAR? They may be able to remote in and diagnose the problem.
I appreciate the replies. I did get some input from SW itself that there might be a hotfix for this problem. I called support (thanks for the push Dan), & they were able to get this rectified. For anyone that has this issue the hotfix number is #1047341.