I've been trying to download from gf2 for a few hours. Couldn't download a magnet link, straight to need more sources (she saw it as uploading, but at 0%). Direct connect works but downloading from there gives a 'waiting on busy hosts' then 'need more sources'. Re-searching connects the download for a couple of secs, then back to busy host & so on...
gf2's recieved incoming is true. She's had a couple of uploads make it to 1%, but not mine (sob). My attempted downloads show for her as transfer interrupted or upload limit reached. She's done a speed test & been through the optimising thread. She's deleted preferences. Upload slots are not zero, uploads per person are not zero. She can download from me.
Using the router in UPnP mode was tried earlier & didn't work. AFAIK Comcast don't throttle uploads (can't find any evidence anyway). Even tried turning off the McAfee firewall but that made no difference.