OK, it seems the buttons when grouped with content loose their links to the MSO when I cut and pasted into the frame.
I re-linked the buttons to the MSO when in the scrollable frame and they now work.
All part of the learning curve I guess
Just a quick note, if you are designing this for a tablet, you should be using on release, not on click. The learning curve is proving to be a big part of the fun on all of this.
Yes thanks for clarifying, I forgot to mention I'd changed this too, I was just so glad to get it working.
And: if a button sits inside an MSO you cannot target other MSOs.
Adobe should prevent buttons to loose their targets if you copy or cut and paste inside. There also should be a mechanism that. if you copy/paste or cut/paste buttons together with their corresponding MSOs, tie the elements together.
Maybe something like an anchor tool to link a button to a specific state of an MSO or another state behavior that binds the two objects together. Just like anchored text frames or objects anchored to a text frame.
What would be also fine would be an underlying color in the menus of the button palette that indicates what behaviors or possible targets are allowed for specific DPS version installed.