Please try the following build to see if it fixes your 3D issue link
I updated version 8.90.1 with the new devel version LibreELEC-S905.arm-9.0-devel-20180103154127-r27897-geb02a8e.tar
you kindly provided, but unfortuntely the 3D-autoswitch does not work again.
Is there anything I can do? I can provide logfiles tomorrow if necessary (at the moment my wife occupies the TV...)