The BitTorrent logger says Quote:
Failed to post GUI update message: Not enough quota is available to process this command.

The logger gives exactly the same message on the three that wont start

This problem just surfaced. I added two freeleech torrents into the software, but they didn't go beyond the 'finding peers' stage. I checked the torrents' pages and they both indicate a lot of seeders, so it can't be that it's dead. When I checked the tracker, I noticed its status: 'bad ratio: ratio 0.368 (to [sic] many torrents. Your current limit is 3 at the same time. See Rules / To fix limits you could Donate)'. However, my ratio is above the minimum of 0.3. So far I've downloaded 8.43 GB, and I've just confirmed that at the ratio page. Is there any other condition that I didn't meet?

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If you are still having a problem, then look at the number of torrents you are seeding in your client.  I was seeding 600+ torrents, I dropped that down to 100 and have not had the problem since.