I have the same problem with
Replay Media Catcher. Tried both VLC and Applian FLV Player.
You can try to
Repair FLV files by remuxing them with freeware FLV Extract and mp4box. Or even better, just extract AAC audio from FLV files using freeware FLV Extract. You can also convert your recordings to MP3 using RMC itself or any
audio/video converter.