Irritating Popup

I'm having an irritating problem with CMSB v 2.03.

I created a multi-record editor with 2 textfields. Both textfields are mandatory, one textfield has "user may not enter the same value as another record (not case-sensitive)" checked off. This textfield also limits the allowable characters to "0123456789" up to a max of 4 characters.

When I try and add a new record, I get the "Warning" popup (yellow triangle with ! )and a number (the acutal record number). It looks like the record isn't saved as its still open, but when you check, it does exist.

It almost seems like some debug code may have been left active.

Anyone run into this??