Actually, she figured it out herself. Now she's started in on a rev of a VME module... we have eight fast opamps squeezed side-by-side, and they're doing the Mormon Tabernacle Choir imitation at 1 GHz. This will take same serious placement and routing changes to fix.
(THS3201 current-mode opamps... 1.8 GHz, 10v/ns. Joerg will lecture me fer sure.)
John