Just in case it might be helpful for someone else, here is a solution that works for a problem I posted earlier. I exported an AVI from Premiere CS3 and them compressed with Sorenson Squeeze, outputting an FLV. The first 5 seconds had a countdown leader in V1. The title was next in V2, followed by the presentation in V1. There was a gap on V1 for 5 seconds because of the title on V2.
The FLV file played the universal leader, then there was a freeze frame of the first frame of the presenter for 5 seconds, then the presentation. In other words, the title was not visible. I moved the title from V2 to V1 so there would be no gaps in V1, output the AVI, and now the output FLV is fine- the title now plays normally for 5 seconds.