Nexus 9 Marshmallow MM force close screenlock

Hello,

i tried some different Marshmallow Roms and every time i try to set up the screenlock it just force closes.
I have already flashed the correct vendor.img and had never the problem while using LP Roms.
I got back to 5.1.1 and there's no problem at all. Am I missing something? What to do to use the screenlock in Marshmallow?

Thank you all and greetings to the developers i appreciate your work!

Fingerprint Screenlock Crazy

After last update on my SM-G920F (G920FXXU3DPF1) I cannot unlock my phone using my fingerprints most of the times. Sometimes it just works as it should but some other times it says that due to a security policy I have to use my password and it is really annoying.

Does it happen to any of you? Any idea what it can be?

Thank you