The FCs from Gmail are because of the update that came out, so a lot of you have the newest version on your /data partition, and the ROM installs it on /system, which causes a little panic
I've updated the instructions for 1.2.1 upgraders in the OP to just uninstall updates to Gapps (Gmail, Voice Search, Search Bar, Market) prior to updating to 1.3.0, since it automatically installs those updates to /system.
I've updated the instructions for 1.2.1 upgraders in the OP to just uninstall updates to Gapps (Gmail, Voice Search, Search Bar, Market) prior to updating to 1.3.0, since it automatically installs those updates to /system.