Citation entry was working for me in version 0.9.27, but since updating to 0.9.30, I'm now getting the following error when using Magic Citations from Papers 3:
The document “Introduction” could not be exported as “ED519AC7-D27E-487A-A9B1-D76C38CCEE2E-tmp-citations.txt”. You don’t have permission.
When I go to view the permissions for the file however, it tells me that I have both read and write access. Pressing okay to get rid of this prompt, saving, and then attempting to insert the citation again is a temporary fix (the error appears as soon as you try and add a second citation).
Running Manuscripts on OSX Yosemite 10.10.5.