Hi! I have same problem for MyFolio QuickStart 2.5 installation as Installation of GK APPPphone hangs at DB install forum topic.
Installation process stops right at STEP4 and DB remains empty without any sample data included. Also I've tried input the data manually from sql files through SQL but just I'm getting errors.
I've installed dozens of Joomla without this sort of problem. As a test I've done a fresh install from latest Joomla 2.6 + MyFolio template + pluggins without any problems. But latest MyFolio QuickStart 2.5 package don't. As I said before tops installation at Step 4 just reloading the page but without any error message,