why the VTREG(Px) doesn't change responding to the relative register?

hello
with the Keil uVISION2 51 simulation,sometimes,the register has been set,but the relative VTREG doesn't get to change .for example,in my programme,some positions of register P1 has been set 1,but PORT1 has nothing changed.In some particular programs,it gets to be worse.
I wonder if it's a bug of the Keil simulative programme,and how can I make it work?
Thanks and regards
Huihl@netease.com

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