I recently had to install the Nexus versions of Chesko's latest Frostfall version and the Unofficial patches for the base game and 3 DLCs.
But every time I run BOSS to organize the mod deck, and check the data files menu option, these mods always end up being unchecked.
Doesn't matter if I manually position them in the deck according to where BOSS says they should be or leave them checked at the bottom of the stack. They always end up being unchecked after running BOSS.