Default MW600 sounds fine in core but nothign win WMP

Hello, I got the MW600, and i plays music fine through coreplayer but when I try to listen to something in WMP there is no sound at all. This wouldn't be that big of an issue if I could figure out how to get Coreplayer to accept the AVRCP functions of the headset. I have tried the options in the settings that say BT remote plugin (windows a2dp is selected) but whenever I click it core shuts down and when I re-open it is not checked.