I am having the same issue with Combine Fields. Cant change the comma to "->" :-( Can someone from Tableau answer this question ?
I'm having a similar issue. I can change the order of the fields (in this case I want to show them as "<field prev> to <field current>") - but when I close the dialog the change reverts. This is happening on non-date fields with an SSAS data connection.
Did you have any successful resolution here?
For the record, we reshaped the data and stopped baninging our heads on this one.
Funny thing about this thread. I started reading the original post just now without looking at who wrote it. I thought it was a new issue. As I read it I thought, "Wow. Sounds just like something I was running into way back when..."
Sean -- I recommend you start a new thread specific to your issue.