Mouse scroll wheel scrolling twice for each click
Does anyone know what could possibly cause Linux (Debian testing, Gnome w/ Metacity) to scroll twice for each click of the scroll wheel? It's not a big deal on web pages or the like, where I can simply set the scroll speed to 1/2 the desired speed, but in applications where one scroll click is supposed to be one item, it's a pain in the ass. I'm pretty sure the problem is in software.
The mouse is a Logictech optical USB, used with a USB > PS/2 converter.
Edit: mplayer (which will report individual mouse clicks to the console under certain circumstances) reports only a single click per movement of the mouse wheel. The double-click problem shows up most obviously in gqview and evolution, but also seems to be present in evolution and nautilus - so I would assume the problem has something to do with GTK or Gnome.