Much of the LrDevelopController API is broken in languages other than English German or Swedish. When a user switches the language to one of the above, the plugins work normally. See https://groups.google.com/forum/#!topic/midi2lr/BSk7LVw7GTY for a conversation regarding this.
If we're talking about the issue with high core machines, it's being worked on but I don't believe the changes for that will make the next immediate release. (It's a very complex change)
"A French user replaced the TranslatedStrings_Lr_xx_XX.txt file with the file from the previous version of Lightroom."
That confirms the hypothesis that LRDevelopController.getValue() / setValue () are incorrectly translating parameter names for those parameters that depend on process version (there should be no translation at all). I made a version of TranslatedStrings_Lr_fr_FR.txt, restoring the old CC 2015.12 values for the just the ProcessVersion keys, and getValue() / setValue() now work correctly.