g_confrms mangles the occupancy field with -bfac
When g_confrms is called as follows:
g_confrms -f1 dump_Mb_W.pdb -f2 dump_Mb_0.pdb -o fkup.pdb -bfac -n1 MbW.ndx -n2 Mb0.ndx
and the index groups used consists of the C-alphas xcept for the first three residues, the occupancy field is written all wrong. In my case I get zeroes for all atoms, except for the atoms in the index groups, which get an occupancy of 13.02. If I do the same thing without -bfac, of if I chose all C-alphas, I gett 1.00 in for all atoms. Exotic, eh?
I'll get cracking on this bug myself.