Hello,
I tried the import effects function and could not see anything on the right hand side when double clicking - similar to what you have noticed.
I was however able to import the Vixen file as a data layer , render and play it.
(Via the Sequence, Sequence Settings , Data layer , Import option).
is this how you imported your Vix sequences last year - in which case you can do the same this year and then add anything else you wish. If you actually imported them as effects last year , then you must have an xml file that would have been created.
I am not sure if with the Vix file you have , whether that is good to Import effects from. I opened the file in an xml editor and there was not much xml tagged data in it - see attached - there was a lot of stuff after the tags though.
BTW - I substituted the audio file when testing it as it is on your F drive..