SD Drive Shows in Terminology but not Thunar

Hi, I'm a newbie here, but this problem seems expert.

Nutshell: On my machine, Terminology shows SD cards but Thunar does not. (Nor do the other three file managers at Bodhi AppCenter.)

I'm using an Acer Chromebook C710-2826 (released May 2013). Here are system screenshots: 







SD card inserted, Terminology:


SD card inserted, Thunar:


SD card in USB adapter, Terminology:


SD card in USB adapter, Thunar:


Thanks for any help you can provide.