Perhaps a 2 column value list, first column hidden and visible second column value is blank?
The value list consists of 2 rows:
It specifies "Include All Values" and "Show Values from 2nd Row"
Note: This 'phenomenon' appears ONLY in the 'new record' row. All other rows are normal.
It seems that there are some VendorIDs without a VendorName in the Vendor Table.
I just checked. All Vendors have VendorID's and VendorNames. No blanks. No omissions. Still, the question is "Why is this problem ONLY evident on a NEW RECORD"?????
One additional point. If I scroll down the list of vendors, it scrolls up, thereby filling the blank space above. So, perhaps the question really is "Why does the initial popup show the first selection 1/2 way down the listing?"
While it may be no help - I have also experienced this "feature" (ahem) and have noticed that if the popup has quite a few values defined AND the popup is lower down on the layout then this can occur...
Sorry no good news from me. But can confirm at least that someone else has experienced it.