QUOTE (Ol' Scratch @ Oct 27 2011, 07:48 AM)

Well, except for the bit about the Realistic Power (which, incidentally, is another "always on" power) allowing a Fire Spirit to appear as an ordinary woman.
That exactly was the initial problem. Why would the rules of one power disable those of another?
QUOTE (Ol' Scratch @ Oct 27 2011, 07:48 AM)

Most adept powers are "always on," too. But the adept can disable them whenever he wishes.
Which actually are? I just went through the Powers of the BBB. They either require a decision and possibly an action to activate (Astral Perception, Killing Hands etc.) or are indeed always on and have no mention of being able to be turned off (Combat Sense, Improved Reflexes etc.)
QUOTE (Ol' Scratch @ Oct 27 2011, 07:48 AM)

"Always on" is just an easy way to say that a power doesn't require an action to use, requires no conscience effort to maintain, and thus is always assumed to be active. Nowhere does it say it must be active or that under no circumstances can it be disabled.
I don't see what's unclear here. If something is
always on you cannot turn it off at any time since this would break the condition of always.
QUOTE (Ol' Scratch @ Oct 27 2011, 07:48 AM)

Case in point, Energy Aura has the "Action: Auto" label. Looking on page 293 of SR4A, you find out what that means: "Actions: Powers require either a Complex Action or Simple Action to activate, or they Automatically ('Auto') function at all times with no attention from the critter. Auto actions require no action to activate, as they are always on."
Of course such Powers do not require an action to activate because they are already on all the time. And even in the sentence you quoted they say that such powers are "on all the time". You cannot turn something off that is on all the time.