@Scott
The unexplained 'disappearing plugboard' is a known problem.
Firstly, though, if you are mapping author_sort to author in the plugboard you should also UNTICK 'Use author sort for author' in the device interface plugin for the PRST1.
This may not solve the problem on its own. Did you try the action sequence I listed in post #223 above? This worked for me but cannot be described as a definitive solution.
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