I haven't had much time to test out all the features, but I am running into 1 error.
And this ins't going to be helpful to track it down because I'm at work and can't get you the exact error.

I'm using the focusless-leaderless-etc.etc. setup via keyclone and when I hit my follow macro, I get an error popup on the slaves.
They do follow, and the party display updates. I think the error message has something to do with targets...I know..not helpful. I'll try to post a screen shot when I get home.
BUT, I know I downloaded a new version of Jamba last night (I thought was 3a), but these boards are showing that you just posted a version a few hours ago..my timestamps could be wrong though.

The odd thing is, my assist macro is set up just like my follow macro, and causes no errors. So I think it has something to do with the actual follow comman, or perhaps the target they are supposed to follow.