I'm using the 10.1 M1 build, and I tried installing a font. It is the Ubuntu medium font. I don't know why, but it caused a bootloop. I restored /system from TWRP, and I installed the Ubuntu regular font. It booted just fine. What is the major difference between the two that makes the ROM break?
Phone: Verizon Samsung Galaxy SIII - (Previously) Unlocked Bootloader
Tablet: Google Nexus 7 (2013) 32GB Wifi-only - Unlocked Bootloader.
Previous Phone: Xperia Play (R800x) - Unlocked Bootloader
Previous Tablet: Google Nexus 7 32GB Wifi-Only - Unlocked Bootloader, bad screen. Somehow, I managed to not take care of this device very well.