hello,
i am apple tecnician in a video production house in sao paulo, we bought 3 mac pro 2.66, and it came with 10.4.7, and i am unable to install 10.4.6 in it, so i figure out how to avoid after effects 7 crash in 10.4.7, just do this:
backup your data, insert os 10.4.x dvd, choose english as language, than when the dvd begins, open disk utilitie, go in erase and erase your hard drive, without partition, with zero all data option, than when is formated, install 10.4.x in it, but install only the system and the fonts, do not install bindle software and printers or other stuff, finish the instalation, than install after effects 7 in os 10.4.7, do not install cycore and keylight yet, open after effects 7, it will open normally, close it, install the plugins, reopen it, again all works, than reinstall your data and all your applications, verything will work perfect, include after effects 7
this was made in 3 mac pro 2.66 with 1 g of ram each, geforce 7300 video card and black magic decklink hd with the latest drivers
i hope that helps you guys