I'm wondering if anyone else is running into this issue with CC 18 it happens on both Windows and Mac. When selecting a text layer with a layer mask it is by default selecting to the layer mask instead of the text. Even when physically clicking the "T" icon on the layer from another layer it is initially focusing on the layer mask.
A big problem that I run into is that when moving at a fast pace and you select the layer to change the color of the text, since by default it selects the layer mask, when you go to change the color it will ultimately change the opacity which is obviously extremely frustrating.
If you create an object or anything else and add a layer mask it will work correctly and focus on the object and not the layer mask.