Work Flow: Cannot keep the selected Action for Trigger?

Hi,
I set up a workflow to work with the trigger and action. it appears to work properly for most of the content types I have, but there is a major CCK contenttype that does not work with the workflow. That content type works fine by itself like the rest; but if i try to assign a trigger for the Action of this content type, like content post, or update, it will not stay here and being listed as selected trigger assignments. The odd thing is there is nothing odd and different from the other types, but the other types work fine and properly.

Could anyone help me with it? Maybe need debug something to fix it? Maybe some setting issue? thanks! huj