glite-yaim-core to version >4.0.4-1 doesn't recognise anymore VO_$vo_VOMSES even if set correctly in the vo.d dir. I'm still wondering how the testing is performed. Primary functionalities like completion without self-evident errors seems to be overlooked. Anyway, looking on the bright side... the bug will be fixed in yaim-core 4.0.5-something. In the meantime I had to downgrade
glite-yaim-core to 4.0.3-13
glite-yaim-lcg-ce to 4.0.2-1
lcg-CE to 3.1.5-0
which was the combination previously working.