I was trying to build an end portal in creative and used the usual method. When I completed the portal frame and placed in the eyes of ender, the portal was not activated.
Instead, ender portals with frames placed facing the opposite direction (manually placed by walking around the portal in a circle) will "activate" by placing 3 brick blocks instead of 9 end portal blocks as shown in the attached screenshots.
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place all the frames from inside to the outside

I went to a normal End Portal from a stronghold in 16w02a and it wouldn't activate when I inserted all the Eye of Ender.
All I can say is: this must be fixed.

Seed and coords?

This happened to me with a naturally generated Ender Portal in 16w02a.
Seed: 42
Cords: -211 / 45 / -813
Edit: I was in creative mode when I placed the Ender Eyes. Not sure if it would have made a difference if I were in survial mode.

ender eyes have a certain position to active the portal

@unknown this is appearently about a naturally generated portal, read the comments

Confirmed for
16w02a
Activating an End portal does not work, neither in Survival

yup, confirmed, even with correct setup from inside to outside

Confirmed. Building and activating an end portal facing the opposite way places 3 brick blocks above and to the side of the portal 😃

(hm, brick blocks don't appear for me tho, just saying)

You have to place every piece of the frame facing the outside.

wait, wasn't it the other way around?

That's what you have to do to get the bricks. I assume they were messing with block states or end portal frame detection, switched up the directions and were using brick blocks instead of end portal blocks so successful activations wouldn't teleport them away from their testing environment.
Usually, to get a functioning end portal, you have to place the frames from the inside.

ok, now I get the bricks too indeed (perhaps worth mentioning this in the description too?) (they always appear on the x+ z+ side of the portal BTW, no matter what eye you place in last)

Confirmed: activating portal doesn't work. Building portal with portal frame blocks oriented backwards produced 3 brick blocks.

This is fixed in 16w03a