Adobe has just released version 1.0.1 of the FLVPlayback component for Flash Professional 8.

You can download it at http://www.adobe.com/support/flash/downloads.html#flash8

This update addresses a few issues around SMIL parsing, some streaming issues when using FMS, and some minor UI issues with custom components.

Full bug fixes can be found in the Release Notes:
Release Note 1
Release Note 2
Release Note 3