Product Configuration help

Hello guys, im planning to setup an online store for my custom computer building business, im currently using the CS-Cart Professional demo to test out this commerce solution before buying it if it works out.

I tried the Product Configuration add-on, however, i cant seem to get it to work right. So iv set a configuration for my product CPU and Motherboard selection for now but when after iv selected the CPU and continue on to select the Motherboard, it only shows the price of the Motherboard and when i go back to the CPU selection, no selection can be made and i cannot go back to Motherboard selection as CPU is set to required.

Any ideas guys?