SOSEND_LOAN problems in MIPS

[coypu%SDF.ORG@localhost]

Hi,

in emulating pmax with gxemul I had trouble using:
  cat somefile | command

when somefile is bigger than 4096 bytes.
it shows no output when with a slightly smaller file, it would.

using options SOSEND_NO_LOAN 'fixes' it.
seems many MIPS configs have this option.

what is a good way to figure out what is wrong?

thanks