Linux + Calibre + Boyue T62D + MTP = Problems... for me

I am new to Linux. Used to use Windows.

I have 2 Linux set-ups now: Ubuntu Gnome 16.04 LTS and Zorin OS11 (based on Ubuntu 15 if I understand correctly). Both these behave the same way in this case.

I have a Boyue T62D (running the Energy Sistem firmware)
When I have the "USB Connect Mode" set to "MTP" (Under Settings > User settings), I experience exactly the issue mentioned here: http://www.mobileread.com/forums/sho...d.php?t=271220 (Calibre 2.51.0 triggers MTP failure with particular device)
(The MTP device mounts OK when plugged into the USB port, and I can see and browse the contents, but as soon as I start Calibre, then it seems to unmount -> try to re-mount -> unmount -> try to re-mount...etc. until I close Calibre or unplug the device.)

When I set "USB Connect Mode" set to "Mass Storage", everything works as expected.

Under Windows, both settings work without problems.

Other MTP devices (Nexus 7 and Samsung phone) works correctly in MTP mode.

I suspect it is a Ubuntu<>Calibre<>T62D issue, but am not sure where to start looking for a solution... Any advice or pointers would be appreciated.