I am Running QGIS Lisboa 1.8.0 on a MacBook Pro. I have several vector layers with similar information which clutter the Layers panel. I created a group to put them in but when I drag and drop the layers into the new group I get just so many into the new group and then the layers panel becomes unstable. I can start to drag another layer and the new group disappears. QGIS then exits generating a large error report. I am using the method given in the manual for QGIS 1.7.0 and it appears to work up to the point where it all goes wrong.
Is this a known problem with this version of QGIS? I havent been able to find a reference to this particular problem.