Howzit
I could just give you the answer, but this way you may get it.
This is from your post 15, where you unknowingly provided the solution
Your combobox returned S so in the criteria part of the dlookup you need to use the field in tblAppointmentTypes that holds the value S.
In your case the dlookup contains 3 parts
- The field you want the dlookup to return
- the table to perform the dlookup on
- the field specifying which record to return
Lol, :s is an emotion lol - means confused

Nothing is returning S. Maybe I should have been more clear
