Double clikcing a word in the NA27 with McReynolds (both with and without GRAMCORD) does not open an appropriate resource. However, keylinks can be executed by right-clicking on a word and then choosing an option.
It's sluggish, but I can keylink to DBL Greek by double-clicking.
Ok, I have figured out the problem here. If you double click on the English gloss in either NA27 interlinear (with or without GRAMCORD), then the keylink will execute. However, double clicking on Greek text, lemma, or morphology lines of the interlinear does nothing.