The problem may be related to bug 3130972.
http://metalink.oracle.com/metalink/...T&id=3130972.8

What do you get when you execute the following query?

select ksppinm, ksppstvl, ksppdesc
from x$ksppi x, x$ksppcv y
where x.indx = y.indx
and (KSPPINM like '%smm%max_size%' or KSPPINM like '%pga%')