The choice of character sheet also affects how monsters and other NPCs are displayed. Rime of the Frost maiden is no different. From my understanding of your description, the monster tokens are on the map, but when you shift click them, you only see tabs for Bio and Attributes & Abilities? If no character sheet tab is present, then no character sheet was chosen at campaign creation time. Choice of character sheet also affects display of NPC statblocks. If I am not understanding the issue properly, screen shots might help.