Resolve Bedpostx issue

If one previously established SGE engine environment for some other job, bedpostx_gpu will display error and stop.

exit: 412: Illegal number: -1
You will get an email at the end of the post-processing stage.

Of course the mail will never arrive.

Simple resolution. The error is due to inappropriate FSLPARALLEL setting.

unset SGE_ROOT
unset FSLPARALLEL

Than run bedpostx_gpu.

Again and always, thanks so much, Moises.