Connection problem after update to ver. 1.8.2

[jakubi]

I had uTorrent 1.8.1 working (under Win XP SP2), with slow download / upload rates (in the range 5-10KB/s), as usual because of the ISP throttling at this time of the day, but steady. Then, I have selected "Help > Check for Updates" for upgrading to ver. 1.8.2. Few seconds later uTorrent closed, and when I have launched it again it was 1.8.2 as expected (I have upgraded uTorrent many times this way, without any problem).

But then download / upload traffic no longer recovered their previous rates. Rather, along the last two hours, they became almost vanishing but for exceptional periods of a few seconds (reaching 1KB/s or so)

May be just chance that the the throttling turned out stronger at the same time of the upgrade, but sounds a bit unlikely. Indeed, no other change occurred on this side.

Any idea? What additional information would be useful to diagnose this issue?

Assuming that it could be relevant, I am pasting below a sample piece of log, taken at random, showing some error messages.

Regards, Alejandro

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[2009-05-10 21:26:51] 117.194.225.33:61503: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:26:51] 71.97.158.92:46855: Connecting: source: THX

[2009-05-10 21:26:54] 71.63.234.177:56563: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:26:54] 94.23.144.16:28284: Connecting: source: T

[2009-05-10 21:26:56] 80.101.188.104:15089: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:26:56] 94.23.144.16:28284: Disconnect: Peer error: No se ha podido establecer conexión ya que el equipo de destino ha denegado activamente dicha conexión.

[2009-05-10 21:26:56] 69.105.96.36:45258: Connecting: source: THX

[2009-05-10 21:26:56] 65.5.204.8:12000: Connecting: source: THX

[2009-05-10 21:26:57] 117.194.225.65:61503: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:26:57] 94.71.192.247:40442: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:26:57] 24.255.166.46:65035: Connecting: source: THX

[2009-05-10 21:26:57] 192.168.0.9:30366: Connecting: source: X

[2009-05-10 21:26:59] 85.81.46.7:6884: [libTorrent 0.12.2 (55.1)]: Disconnect: Connection closed

[2009-05-10 21:27:01] 68.32.5.42:21771: [µTorrent 1.8.1 (55.1)]: Disconnect: Timeout due to inactivity

[2009-05-10 21:27:02] 67.127.59.127:43304: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:27:02] 68.212.249.135:50980: Connecting: source: T

[2009-05-10 21:27:05] 220.245.238.189:40236: Disconnect: Peer error: offline (timed out)

[2009-05-10 21:27:06] 78.133.27.23:47943: Connecting: source: THX

[DreadWingKnight]

What internet security software do you have installed?

[jakubi]

Used and found nothing.

[DreadWingKnight]

That doesn't answer my question.

Some internet security software can actually be the CAUSE of this problem.