Cannot import a new catalog into Mix'n'match (auth error)

[Former user]

I'm trying to import a new catalog that I manually prepared. When I click import it uploads the file and then tells me I'm not logged in to WiDaR. I re-tried multiple times though it does say it is experimental. I know I was logged in since could use other MnM functions. Here is what I typed in (seems dropbox embeds don't work):

and here is the file I tried to upload.

https://www.dropbox.com/s/f3ct0mph1gjfh4p/exported-general-winner-data?dl=0 (warning 11MB text)