Inventory items undiscoverable

I have a bug (I assume) where all of a sudden my sims inventory/fridge inventory items are there but undiscoverable to use ie. I have upgrade parts in my sims inventory but cannot upgrade my shower because "Your sim does not have the required upgrade parts" and I am trying to cook with simple living enabled but none of my ingredients are available even though they are in the fridge - I have tried restarting but no joy

Thanks in advance for any help