Put the summary of the bug you're having here
What I expected to happen was...:
there is new update "if we stand on weighted pressure plate it will work"
What actually happened was...:
when i check back on mojang there's no new update like that
Steps to Reproduce:
1. Put a Weighted pressure plate (iron or gold)
2. stand on it
3. then it will have clicked sound like normal pressure plate (wood or stone)
The weighted pressure plate weighs entities, since the player is an entity too, it will give a signal of strength 1. See http://minecraft.gamepedia.com/Weighted_Pressure_Plate