cffile, accept, .docx misreporting as .zip

Using CF11, MacOS.

I have a file upload which accepts doc, docx, pdf. Doc and pdf behave as expected. However, whenever I try to upload a docx I receive the following error: "The MIME type or the Extension of the uploaded file application/zip was not accepted by the server".

I saw that there was a similar bug that was meant to be fixed in CF11, see this thread: Tracker

My cffile tag looks like this:

<cffile action = "uploadAll"

  fileField = "arguments.stuData.addDocuments"

  destination = "#dirTemp#"

  nameConflict = "MakeUnique"

  result="arrResult"

  accept = "application/pdf,application/msword,application/vnd.openxmlformats-officedocument.wordprocessingml.document,application/x-tika-msoffice"

/>

Can anyone help?