I noticed in my database design that a text field should have featured a drop-down menu, with options therein to pick from.
I have gone into the Design Mode to amend this but have been told that Relationships needed to be deleted. I have done this and then rebuilt the relationships between my forms.
However, while I now have the drop-down feature, the option list is blank!
My source form from which the pick-list should be offering options is populated and the Look-up tab on the Design screen appears identical to other -working! - pick-lists!
What on earth has happened?!