I'm new to all this, so sorry if this is in the wrong thread/topic.

I have FW and have same probs with uploading (downloading is ok) My system:

Windows XP pro (AMD Athlon 64 3500+)
Sygate Personal Pro software firewall
Router (unbranded) 4 ports 11g wireless ADSL with firewall
1 gig Ram
320 gig HD (currently using only 7%)
ADSL broadband 1 mbps (connecting from home)
ISP - Pipex
Sharing connection with laptop (occasionally)

When I checked Bug reports (view example) I got "received incoming this session" : false.

I don't know how to configure my router properly - I've been to the site you recommend but my router isn't listed so I can't get instructions on how to set it up. At the moment I have configured Frostwire to use UPnP.

I do not have Sygate firewall blocking Frostwire in any way (although FW is not showing as a running application even though it's connected) so it must be the router giving the problems I think.