Nope, I can now add to my queue, but it won't actually download using 5.0.5.0.
My assumption is there's a phone home feature in the software and their server is not working properly for whatever reason, based on it affecting all versions, all sites, and only this brand. there are other servers in their purview that appear to be failing randomly. Yes it's an assumption but the only situation that really makes sense.
potenial_user
You would be correct that it phones home, it gets the decryption keys for the content from their server, which seems to not be working. Without the decryption keys, most things won't work since streamfab doesn't have the keys locally, aside from a few services where it still can (IE discovery, tubi, crunchyroll, and funimation)