CC2530: 32 kHz clock is not running and timers are not working

I have a problem with getting 32 kHz oscillator to run. I suppose that either XOSC or RCOSC should run automatically after reset. However, SLEEPSTA.CLK32K stays low indefinitely. What is even more weird is that CLKCONSTA is always zero even if I write something to CLKCONCMD register.

So it seems that I've missed some initialize step somewhere but I cannot understand what. This code has been working earlier (it is part of a bigger project) so I don't understand why it's not working any more. Could there be some hardware issue (not probable since same HW is used in another project and it's working)? I have a CC debugger with IAR and I can verify that code is working except that 32 kHz clock is not running and therefore timers are not working. Any help would be greatly appreciated!

Here is a code snippet of affected code part:

CLKCONCMD = 0x98;                             // 32kHz RCOSC : 32MHz XOSC : Tick 4MHz : System 32 MHz

// Enable Interrupts and receiver;
P0IE = 1;                         // Enable Interrupts from Port 0 
IEN2 |= 0x10;                     // Enable Interrupts from Port 1
IEN2 |= 0x02;                     // Enable Interrupts from Port 2
__enable_interrupt();

if(SleepState > kSleepIdle) { 
          // wait for 32MHz clock to stabilize
        while((CLKCONSTA & 0x40)) {   // I have noticed that CLKCONSTA is always zero
          ;
        }
          // wait for positive transition on 32kHz clock (CLK32K bit) - Sleep timer register has been updated
        while((SLEEPSTA & 0x01)) {   // Wait for a low or already in a low
          ;
        }
        while(!(SLEEPSTA & 0x01)) {  // Wait for a high. Code never continues from here, because clock stays low!
          ;
        }
        Timer2SyncStart();  // Restart Timer2
      }