A user forum thread at ESRI about crashing issues with ArcMap 10.1 SP1 sheds some light on how bugs are identified. Reply # 55 lists the answer.
Apparently ArcMap 10.1 has some issues with stability when the Georeferencing toolbar is open and a large number of rasters are present in a map document. A fix is planned for ArcGIS 10.2 (coming this summer, perhaps July of 2013?) but some workarounds are listed in the discussion.