Hey James,
Appreciate you bringing this to my attention, i found the issue and i hope its all fixed now!
Each product or component must have a publish revision before it can be used in the planner, over the cause of many months i added many different products in to the database and was working fine, i then later added a published revision feature so it would only show products with real stats and data could be shown in the menu, the issue was i had never gone back and marked them as published revision once i was done, i have checked that and they're now visible, the products are now showing and working as intended,
once again, thanks for bringing this to my attention, if you have any products you'd like to see added or features please let me know, as this is a constant work in progress to make it better for the community!
regards
Darren