Ok, now I see the problem. Thank you all !!.

> If the change occurs just as PORTB is being read, the interrupt flag won't
be
> set and no interrupt will be generated. What many people don't realize is
that
> every instruction that accesses PORTB will read it.

...

> My suggestion is that either you use it ONLY for wake-up from sleep, or
take
> your chances otherwise and be prepared to spend MANY hours debugging a
> seemingly random problem.  Can it be done?  Sure, but you have to really
> know when you're modifying the port and keep any interrupts on pin change
> COMPETELY separated from these port read/writes.

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics