The mouse wheel doesn't scroll at all after I leave Edit mode. In the chat box, song select menu, multiplayer lobby, ect. The only solution I found to fix this was to restart Osu!.
^An64fan wrote:
I don't know how useful this is, but it seems that the mouse wheel locks whenever you browse for something from the editor (adding background image/video, or adding sprites to the sprite library). The wheel doesn't lock up when you check the sprite library and your desired images are already in the song folder (but clicking browse, again, locks it up).