I'm having a similar problem. I had downloaded files with no peers and recently downloaded a large file with peers in the hopes that I could seed but I haven't uploaded anything. I've had no problems seeding other torrents, and I've just disabled my firewall hoping that'd fix it but no results.

Would port forwarding resolve my issue or is it that I'm at the bottom of the seeder preferences because of poor upload speeds? If I can't figure this out now I'll just donate but I'd like to be able to seed torrents in the future.