I noticed a problem with ktorrent 2.2, which wasn't present in 2.1.4. Over night, my ISP is borking the network, so there is downtime for about half hour every night. After that IP changes and network is up again. Ktorrent 2.2 seems like it doesn't resume seeding/downloading when network is up again. Manually restarting Ktorrent helps, but it was not needed in 2.1.4.

I have a 1024kbps/256kbps DSL line, router itself connects to the net, my computer is behind it (properly forwarded ports).

What if you wait some time ?

There aren't that many changes in the core bittorrent code between 2.1.4 and 2.2 (mostly bug fixes).

I woke up today, and there was an iso stalled at ~200MB, when I went to sleep (around 2am) it was at 150MB. At night I don't use dl/ul limits, so if you do the math you see that waiting doesn't help. I have a network monitoring applet, which was showing burst of ul data (smaller burst of dl too, but just some kbps) in 10-sec interval. After restarting ktorrent, ul/dl resumed with full speed as it should at this time.