If FLV videos don't display when your Articulate content is hosted on a server, it's likely that the server isn't configured to play FLV files.
Some servers don't have an associated MIME type to support FLV files. To correct it, do the following on your server:
Your FLV videos should now play when viewed from the server. If you use a hosting company to host your files, it's best to check with them about adding FLV as a supported MIME type.