I observe that, under Mac OS X 10.6.4, Qgis revision 13519 downloaded from http://www.kyngchaos.com/software/qgis opens a Qgis project in 2 seconds, while opening the same Qgis project with Qgis revision 13597 downloaded from http://www.kyngchaos.com/software/qgis keeps the CPU 100% busy for 360 seconds. Greg