Ah, I apologize, I forgot about that dropdown menu. I’m not certain whether those are intended to work ( Level Blueprint is tied to map, which may have different save requirements), but I’ve created a bug report for options being grayed out (UE-27066). At very least, it would be nice to see a tool-tip explaining why options aren’t available, if it’s not possible to save-on-compile Level BP.
I’ll post here when I see any updates. For now, just be sure to Save level frequently as you make changes. Thanks!