DW MX is driving me crazy - record insert command

I have finally gotten lots of stuff working here and now DW has started
going nuts on me. Everytime I check out the Insert Record info box and
choose my Thankyou.asp page as the page to go to after inserting the record
and click OK, DW plugs into the form code - Action="MM_EditAction" which, of
course crashes when I try to run it since there exists no page named that.
Whenever I manually select the form and in the action box choose the folder
icon and navigate to the Thankyou.asp file it inserts it and everything
works fine but the red exclamation point is beside the Insert Record icon.
Any ideas on how to fix this?

George