Getting a lock screen to work with FP sensor

Hello,
I just installed "Next" lockscreen, and am having trouble getting the fingerprint sensor to work with it. If I disable the default lockscreen, it also disables the sensor. However, if I enable the sensor, it also seems to enable the default lock screen again... prompting me to swipe up once to dismiss Next, and then swipe down to dismiss the default lockscreen.
Anyone ever have similar issues and know a workaround? :-[