Forum: GNU Radio import error in multimode.py

hello all.  i  am trying to run multimode.py in the GRC. GRC shows the 
import error in its flow graph error viewer:

Error 0:
Block - import_0_0_0 - Import(import):
  Param - Import(import):
    Import "import multimode_helper as mh" failed.

The directory /home/matt/bin contains "multimode_helper.py" and this 
file path is in the PYTHONPATH.  since i know the correct file path is 
in PYTHONPATH and i am still getting the import error i am really 
confused here.

Thanks for any help.

Matt