So on my faction server I have the plugin ShopGUI+ and for some reason only OP's can use the shop. members can open the menu but cannot open any specified shops. Any ideas?
Seems to me you gave users general permission to open the shop list menu, but not the shop names, etc.
Try adding this permission to member group. Make sure you replace SHOP_ID with the name of your shop you're tying to let players access. So for example if your shop's name in config was 'blocks' you would add this permission to the group: shopguiplus.shops.blocks