[manis]

the PT 7.3 IS a complete installation, I installed 7.3.1 over the top and no problem.., as for the ignition pack, welcome to the nightmare, it becomes a dream when you get the correct updates.., check out protools announcements, answers there. (it had me tearing my hair out but now it is all very sweet and i have only had the mac 2 months, took three-four week of screaming t digi and protools through the wall of my studio before I finally worked it out, been using PC and cubase for years).

sounds like some of your plugins are not Universal, select one at a time and then 'get info' from the finder menu and 'universal' will be next to the name of the plugin if it is, you might find some answers there.