By putting a powered rail down and powering it, putting the next powered rail on block above will not update.
See video for detail
https://www.dropbox.com/s/ydcy11dl0n3mdkp/bug.avi
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Comments 7
The track that was on the upper block faced east,
you have to place the rails in the exact order as in video.
EDIT: rail on top block must be facing away to start look at pic
-Had the track in the same cardinal direction and placed them as shown in the video. - Cannot reproduce.-
Reproduced, this only seems to happen in the east-west direction. Redstone block must be on the west for this to reproduce, west-east issue does not occur.
Cannot confirm, see screenshots (placed top rail first, then rail below redstone block).