This is what I found out. The new entry is in the "MemberT". The new entry is also listed on the "MemberListF". The Record Source is "MemberSortedQ". When I open the Master Roster (Main Menu)and select the new entry, it opens to a blank form with a (New) Member ID.If I fill this form again, it will set up a new ID. Will list it on the Main Menu Master List but it still won't open, it just repeats the cycle. This doesn't happen to the rest of the list. The new entry does not appear on the "MemberQ". Everyone else, there is no problem. Can this help. I'm at a loss. In November 2017 it was working. Now it dosn't. I don't know how to trouble shoot this.

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Reply from Alex Hedley:

What won't open?
Does it show in the MemberT, MemberSortedQ?
Does MemberQ have any filters/criteria?