I have same issue in Magento 1.9
i'm using magento 18.104.22.168
- Login to a customer accounts
- Try to add something to the shopping cart and place an order
- After order is saved go back to store and try to add something else to the shopping cart.
- It returns an error message: Cannot add the item to shopping cart.
- If i logout and login back i can add the product to shopping cart and place order as normal