I can provide a video if needed but pretty much since the redstone update (1.5) to the latest 13w38c snapshot. It appears that if you have a wire coming off of a T-Flip flop going east it will not trigger the flip flop but does when it goes west.
It only seems to trigger on the 2nd block after the turn to the east as seen in the screen shot with a red square around a block
See screenshots for a better explanation.
Additional notes:
In my example i have 2 inputs which does not affect the end result.
Did not try in a north south variation
Each input yields same result
Temporary solution is to just run the wire straight or repeater then wire or run it to the west.
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can not reproduce. All 4 directions trigger correctly (see screen shot)

Alright so it is only happening in two completely unrelated worlds which one is on a server hosted elsewhere and the other is a local map. Since @The3F4114n0n3 was unable to reproduce could i get an idea of why it may be happening then?