Perhaps this is something obvious, and I'm just not seeing it, in which case, I apologize for the wasted space.
I have my layout set up allright. However, when in party, I get 2 unit frames for each member of the party, instead of just one; this generates two vertical rows of units parallel to each other, and one of them is colliding with other elements of my UI. Am I doing something wrong? I doubt this would be a previously unnoticed bug that sneaked past alpha into this late stage in testing.