I never had that setting enabled.
I went to control panel and enabled "Mount Removable drives" and "Mount Removable media" Closed, opened and disabled again.
Then unmounted Android Tablet and restarted Calibre. Still didn't work.
Exited Calibre, did "refresh" on the red Android in the 3rd party USBView utiilities and started Calibre again. THen it was detected as MTP.
Linux Mint 18.3 with Mate.
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