Hey everyone, I've noticed that several of the native filters in CC, especially under "render" (i.e. flames, lighting effects) are grayed out no matter what I do. Whether it's in 8 bit or 16 bit mode, I simply cannot use those effects.
The render flames filter requires you to first define a path before you can define the flame, but it's not greyed out for me before I do... Unless you have a filter, or locked layer as your active layer. It doesn't create a layer, but modifies the layer your on. Hope that's helpful.