And a new build is available that bakes my trimmed (holed) surface. Do I get a prize for reporting a “blocker bug”? Or was that one too obvious? 
The ‘Auto Cplane’ problem returned with the new build but this time I know what to do about it. It really is a mistake to have that feature enabled by default, for two reasons:
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When running Grasshopper, it is customary to allocate half the screen to Rhino and the other half to GH. When that is done, the ‘Auto Cplane’ toggle at the bottom is invisible, off the screen.
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There is no obvious indication that mode is active, giving some clue about what is happening and where to look to turn it off.