I have the strange behavior if i hide tracks, or if i have folders. I think i may have narrowed it down though.. If i turn off zoom horizontal and vertically together, and use control+alt mouse wheel it seems to zoom horizontially as intended. But if i use only alt+mouse wheel to zoom the tracks vertically, it jumps to the top or bottom of the view. So the bug seems to be involved in the vertical zoom. I will continue to work in sonar and report anything more like this that i find, or if the horizontal zoom gets weird after extended use.