I thought your devs might want to see this LGoodDatePicker bug report. (Since you seem to have a wider user base I thought it might affect your project.) I don't have a Mac OSX (or linux) machine to reproduce the reported bug but I thought a developer here might. The reported bug does -not- appear on windows 8.1, with a compile and run under Java 8 update 121.

LGoodDatePicker/LGoodDatePicker#49

Warm regards,
-Blake