[Myrinet] "Message truncated" from MPI_SENDRECV in MPICH-GM!

Hi,
   We have installed gm-1.5pre4 and mpich-1.2.1..7 in our Myrinet 2000 based
linux cluster. And we've used it for a long time. But now we got problems with
mpich-gm programs. 
   Our program using mpich-1.2.1..7 is ok with small scale communication,
but with larger scale communication, there are errors "Message truncated
from MPI_SENDRECV". It seems that anything is wrong with mpich-1.2.1..7.
The configuration command of mpich-gm is as default:
   ./configure -nodevdebug -cflags="-I$GM_HOME/binary/include \
             -I$GM_HOME/include" -opt=-O2  -device=ch_gm -noromio \
             -noc++ --disable-f90 \
             --lib="-L$GM_HOME/binary/lib/ -L$GM_HOME/lib/ -lgm -lpthread " \
             -arch=LINUX -fc=g77 -cc=gcc -rsh=rsh

   Does anyone know the problem ? Any information is greatly appreciated :-)

Best regards
Geoge
Tsinghua University