Updated below: Perhaps Michael Snyder stepped down as CEO of Vonage because he realized he wasn't the best executive for the job. But naming company founder Jeffrey Citron as interim CEO--even for a short time--may not be the best fix either. Why? Citron has had his run-ins with the Securities and Exchange Commission while he was at Datek Online Holdings over securities fraud allegations. He was barred from associating with any securities broker or dealer and paid $22.5 million in civil penalties. From Vonage's IPO filing dated August 2006: "Citron and other individuals participated in an extensive fraudulent scheme involving improper use of the Nasdaq Stock Market's Small Order Execution System, or SOES.