Melodyne - sounds very strange with even just one note

Hey all,
 
I'm in Melodyne (Sonar X3) - and I just made a really small pitch adjustment to one single note (about +9 cents), and now that note sounds really weird and robotic, and not at all like the other ones.  And I just made very small pitch adjustment.   What's worse,  when I do an Undo and return to the original pitch I sang,  the robotic weird tone did not go away.      Is there a setting or something I missed?
 

I thought I changed the buffer from 256 to 1024 but it didn't seem to help so I might have changed it in the right place.   I changed it in Edit --> Prefs --> Audio --> Sync and Caching --> File System
 
Is there another place I should change it in?
 
 

I thought I changed the buffer from 256 to 1024 but it didn't seem to help so I might have changed it in the right place. I changed it in Edit --> Prefs --> Audio --> Sync and Caching --> File System

 
When Melodyne recommends a buffer size of 1024 it refers to your audio interface driver buffers not the one's you have changed (they're your disk read/write buffers.) I'm not sure why your interface buffer options are greyed out. In any case, I've successfully edited many clips at lower buffer sizes than 1024, even though Melodyne will give you the message to change it.

Is there a box anywhere that has ASIO Panel written on it? That should get you in to your interface's driver options. The Buffer Size slider thingy might be greyed out but you should still be able to access your interface's buffer settings through the ASIO Panel.

I would recommend that you increase the buffer to medium or high, during Melodyne editing.
Best of luck.

It's possible that Melodyne detected that note an octave lower than it actually is.  Below is an excerpt from the following URL: http://helpcenter.celemony.com/editor2/en/singletrack_tour_02_ede.html
 
Depending upon the material, it can be necessary to edit the detection manually and reassign detected notes. This applies in particular to polyphonic material, in which overtones are sometimes interpreted as independent notes, and not all the notes actually played are invariably displayed. With melodic material, a note may occasionally be confused with the same note an octave higher or lower. Before editing such material, you need to reassign these notes to their correct pitches; otherwise tonal artifacts could be produced when the material comes to be edited. The aim is to ensure that the notes you see in Melodyne correspond as closely as possible to the notes actually played.
 
HTH

Try to activate "Show intended notes" from the "view" menu of the Melodyne window. Then move the blob an octave higher/lower to match the correct octave. Otherwise the formants will be interpreted wrong and it will sound like you described. Moving the blobs without the activation will make it even worse...
 
Edit: Forgot to point out that you have to use the "Detection Mode" (the arrow with +-)