Glad you were able to get this fixed - in hindsight, siphon breaks drilled into anything is a poorly designed system. You should not have this issue, ever, if designed properly.
House
Jim,
Sorry but i have to disagree with a necessary syphon break being poorly designed. Especially in the case w/ using Wavy Seas or Sea Swirls on the returns. These devices can lower the return much lower into the display than a standard return. In my opinion having a giant sump to accomodate draining 6-8" of water from the display is a waste of space and a poor design. The only way around this is a check valve or a syphon break...Syphon break being the most reliable solution.
Also a sidenote, The AGA/Oceanic brand overflow kits have the syphon break already pre-drilled in the return.