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Problem with external interrupt and ISR function

Hi, I use the external interrupt INT0 that call the function IO_vidHandlerButton1() when the interrupt is to be serviced. The code did work before but now the function is not call anymore by the ISR whereas a falling edge on the pin of the INT0 wakes up the micro and sets its interrupt flag in the EXTINT register.
Does anybody know what the problem is?

u8 IO_u8Init(void)
{


    IO_bButton1 = 0;
    USER_u8FLAG_INT_BUTTON = BTY_u8CLEAR;


    EXTINT = EINT0_FLAG; /* clear interrupt */
    /* disabled interrupts before write the interrup's registers */
    IRQ_u8Disable(IO_U8BUTTON1_INT);

/* assertion of an EINT0 interrupt will wake up the processor from Power Down mode */
        INTWAKE |=  EXTWAKE0;

    PINSEL4 |= 0x00100000;       /* activate the pin P2.10 to works as external interrupt  */
        PINSEL4 &= ~0x00200000;


        /* enables the falling edge interrupt for the pins P2.10, P2.11 and P2.12 */
    EXTMODE |= EINT0_EDGE;      /* INT edge trigger */
    EXTPOLAR &= ~(EXTPOLAR0);       /* INT0 is falling edge sensitive */
    EXTINT = EINT0_FLAG;        /* clear interrupt before enabling the interrupt */
    /* Install the Interrupt Service routines (ISRs) for the button 1 IRQ */
    if ( IRQ_u8Install( IO_U8BUTTON1_INT, (void *)IO_vidHandlerButton1, IRQ_u8PRIORITY6 ) == BTY_u8FALSE )
    {
                return( BTY_u8FALSE );   /* very bad happened */
    }

        return( BTY_u8TRUE );
}

void IO_vidHandlerButton1 (void) __irq
{
        EXTINT = EINT0_FLAG;  /* clear interrupt */

        IO_bButton1 = BTY_u8TRUE;
        USER_u8FLAG_INT_BUTTON = BTY_u8SET;

    VICVectAddr = 0;            /* Acknowledge Interrupt */
}

u8 IRQ_u8Install( u8 u8IntNumber, void *HandlerAddr, u8 u8Priority )
{
    u32 *vect_addr;
    u32 *vect_cntl;

    VICIntEnClr = (u32)1 << u8IntNumber;  /* Disable Interrupt */
    if ( u8IntNumber >= u8VIC_SIZE )
    {
                return ( BTY_u8FALSE );
    }
    else
    {
                /* find first un-assigned VIC address for the handler */
                vect_addr = (u32 *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + (u32)u8IntNumber*4);
                vect_cntl = (u32 *)(VIC_BASE_ADDR + VECT_CNTL_INDEX + (u32)u8IntNumber*4);
                *vect_addr = (u32)HandlerAddr;  /* set interrupt vector */
                *vect_cntl = (u32)u8Priority;
                VICIntEnable = (u32)1 << u8IntNumber;     /* Enable Interrupt */
                return( BTY_u8TRUE );
    }
}