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hi,
I am just performing a simple PAW optimization of BCC Calcium.
here the input file:

 ixc 7 
 optcell 1 
 ionmov  3 
 ntime  20 
 dilatmx 1.05 
 ecutsm  0.5 
 acell 3*8.01 
 rprim 
 -0.5  0.5  0.5 
  0.5 -0.5  0.5 
  0.5  0.5 -0.5 
 ntypat 1 
 znucl 20 
 natom 1 
 typat 1 
 xred 
 0.0  0.0  0.0 
 occopt 4 
 nband 11 
 tsmear 0.005 
 ecut 18.0 
 pawecutdg 60 
 kptopt 1 
 ngkpt 10 10 10 
 nshiftk 2  
 shiftk   
  0.25  0.25  0.25 
 -0.25 -0.25 -0.25 
 nstep 20 
 toldfe 1.0d-12 


note that with FCC structure I've no problem.