There's currently another open question on this as it also happened to me. I believe it's currently a bug in TurboTax. If you're lucky, it's that your K-1 needs to be a Trust which "does" have Line 4c included. But seems to be a bug when TurboTax decides to move data from a Partnership/LLC-type K-1 to a new worksheet. Hopefully they'll have a bug-fix update soon...
