Im****ting Records Problem

I have been Im****ting Records from one file to another with-out any
problems, but I have added one field to the source file and it will not
im****t the new file.   I have done this many time with no problems, but
this
time I'm stumped.  There must something I didn't do and I don't see it. 
Can
you help me?

I'm using Filemaker Pro 9 with Windows XP

CS  Thank you