PIC16F887 PIN Change Interrupt Problem

Versuche in der ISR PORTB zu lesen oder zu schriben, damit das 
Eingangslatch neu geladen wird.

Microchip schrieb im Datenblatt auf S.49:
>For enabled interrupt-on-change pins, the present value
>is compared with the old value latched on the last read
>of PORTB to determine which bits have changed or
>mismatched the old value. The ‘mismatch’ outputs of
>the last read are OR’d together to set the PORTB
>Change Interrupt flag bit (RBIF) in the INTCON register.
>This interrupt can wake the device from Sleep. The user,
>in the Interrupt Service Routine, clears the interrupt by:
>a) Any read or write of PORTB. This will end the
>   mismatch condition.
>b) Clear the flag bit RBIF.

P.S. Wenn das nicht die Lösung ist, solltest du deinen Code posten.