yup! it always hangs on my case when a jumbo app is being installed. it freezes like its always winter. at first time, the battery went out and the n900 turned of resulting for errors that a reflash was suggested for me to do. most of the time when apps are being installed (specially with appman) there is a slight freeze which i believe is normal. sometimes the "wait and see" option is needed, even if it seems like forever.