This system tray icon issue does not occur with any previous build of µTorrent prior to v3.3.1, and the icon immediately re-appears when reverting to v3.3.0. One difference I noticed is that since v3.3.1, µTorrent (uTorrent.exe) contains some unusual icon resolutions (in addition to the standard icons of 32bit 16x16, 24x24, 32x32 plus a 256x256 png of v3.3.0, the new version also contains 32bit 20x20, 40x40, and 64x64). Might the highly unusual 20x20 or 40x40 cause confusion for some systems?