regarding my post http://forum.utorrent.com/viewtopic.php?pid=465534#p465534 I found out that issue was caused by old uTorrent v2.0 data in C:\Users\<UserName>\AppData\Roaming\uTorrent. Removing folder allowed client to start. I tried to import some of my old torrents that were still downloading and found out that this new version of uTorrent has very hard time digesting large torrent files. One i tried to add was 10 megs. Once i opened torrent file uTorrent hang for a long long time, up to 30 mins i think. After that add torrent dialog opened, there i had lagspike each time when i used UI. My guess is that this was caused due to redrawing UI, since listbox with files has insane number of files in it. When i finally clicked ok uTorrent, so far so good, requesting full check hung client again. CPU usage this time was 2-7% (50% during initial torrent loading). This went on for another 30 or so mins. After that seems to work as normal.
