Same problem here, pasting as image from Onenote. Almost 5 years later =(
For those suffering with this, there is a partial workaround, for pasting only text (loses formatting). I use an AutoHotKey script for this. Good thing is it works in any program, not only Evernote.
Script below, extracted from this forum post.
Autohotkey - http://autohotkey.com
ClipSaved := ClipboardAll ;save original clipboard contents
Clipboard = %clipboard% ;remove formatting
Send ^v ;send the Ctrl+V command
Clipboard := ClipSaved ;restore