Saw this thread at the Cakewalk Sonar forum, and thought that it might help some of the folks with MkIII issues.
http://forum.cakewalk.com/fb.asp?m=1526726
Link is to the specific post explaining the fix, but I'd recommend reading the whole thread (it's not that long).
JD
MkIII Installs - This might help someone
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Discussion related to installation, configuration and use of MOTU hardware such as MIDI interfaces, audio interfaces, etc. with Windows
Discussion related to installation, configuration and use of MOTU hardware such as MIDI interfaces, audio interfaces, etc. with Windows