Thanks Chris!
This confirms that the bug exists in both Windows and Macintosh.
Based on this finding I highly recommend that no one use the 9.0.6 update, that is, not unless the benefit of one of the documented fixes in 9.0.6 out weighs the ability to be able to sanely edit MIDI tracks using the MIDI editor.
I suppose one could use the MIDI event editor to edit MIDI. However I personally am much more productive when working with the musical staff.
So - I am now gettting on to the not so fun task of uninstalling and reinstalling.