This is in regard to the features of the Dynamic Components extension, …
so I’m moving it to the Dynamic Components category.
I am also seeing the same bug in SketchUp 2016,
using Dynamic Components extension ver 1.4.0 and 1.4.2.
I am not seeing the bug in SketchUp 2015,
using Dynamic Components extension ver 1.3.2.
BTW, I posted a notice of this bug back in v 1.3.2 (May of 2015) in the DC Errors thread,
but at that time I did not realize it also prevented the “Add All” function from working in the dialog:
Ruby Errors in Dynamic Components - #2 by DanRathbun