Thanks very much for this info re MP evaporation. I’ve reproduced this work-around and found that MP stops evaporating for me as well if I disable my 2nd GPS. I’ve passed this onto @meee1 (Michael Oborne). This could be quite an important find, thanks!
There are instructions for building MP at the bottom of this page which I followed but eventually MO helped me out to get it running so I’m not totally sure if the instructions are complete.
Txs again.