I mentioned this issue in a post made in ricc2 subforum, but maybe its better to report it here, too.
I noticed that in Turbomole 5.9 the $parallel_platform keyword is always set to "cluster" when running parallel calculations with em64t architechture. Would "$parallel_platform MPP" be more appropriate, considering that mpirun_scripts use MPP for all the other x86 and x86-64 based architechtures?