Hy i don't know if this helps or not but after a error message i get this out of blender:
"
Traceback (most recent call last):
File "C:\PROGRA~1\BLENDE~1\BLENDE~1.57B\2.57\scripts\addons\io_import_scene_mhx.py", line 2672, in execute
readMhxFile(self.filepath)
File "C:\PROGRA~1\BLENDE~1\BLENDE~1.57B\2.57\scripts\modules\bpy_types.py", line 626, in __getattribute__
return getattr(properties, attr)
UnicodeDecodeError: 'utf8' codec can't decode byte 0xe1 in position 10: invalid continuation byte
location:<unknown location>:-1
"
This is the official 2.57 blender version win 32bit fresh "install" (zip ver) and MH alpha 6,
I tried the bundled mhx importer, gave the same, deleted pyc file, put in importer from the MH directory did this same error.
I dont see any change in blender after the error msg by the way.
Edit: Also i tried to import a newly made test character made with same alpha 6 and exported with default settings.