I'm new here, but am fairly familiar with Wordpress & Atahualpa. I have a 3.5.1 install on one domain and I have a separate 3.5.3 install on another domain. I'm trying to import the settings file from the 3.5.1 install into the 3.5.3 install (which is a fresh install) and I'm getting the "Sorry, but .... doesn't appear to be a valid Atahualpa settings file" error.
I've tried exporting the 3.5.1 file multiple times. I've tried importing the settings into the 3.5.3 install multiple times. I've tried deleting the bfa_ata4 option on the 3.5.3 install multiple times.
Using Dreamhost for both of these installs.