Just updated to 1.8 (not my fault) and just starting the lost expedition quest. None of the falmer can be looted. They die nicely, but the corpses do not give the option to loot. I was just starting this quest when the update happened so I don't know if this is a problem elsewhere. Looting was working fine until now ...

Falmer Beast can be looted. ASIS and AV installed. So far only Falmer seem to be an issue.