I am having problems with the zoom in QGIS 1.8.0 where a slight move of the scroll wheel on the mouse zooms way way out. It will re-render at each zoom level and with large datasets it takes over the computer for sometimes up to a minute. Is there a way to disable the mouse wheel zoom in QGIS?
In the preferences under 'Panning and Zooming' there is a dropdown labeled 'Mouse Wheel Action'
Set this to 'Nothing' and all will be well.