Evernote still has not fixed this as far as I know,... but I have learned is that for me although the partial screen grab does not work when I have the external monitor plugged in,... when I remove the external monitor it works just fine for me. This is the bug. Might help some of you as we wait for Evernote to fix this. Ugh.
I am having the same issue,... nothing showing up when I do the rectangle grab,... the full screen grab works fine. Ideas EVERNOTE?