When holding mouse over an item in the inventory (specially where next item has an effect). The info will display wrong, usually telling that the item in the next slot is ready to use or not.
This is a problem with the MQ2 compile itself. It will be fixed at some point on the MQ2 website if its not already. Bottom line is I dont think its something thats super important enough for us to push out another compile to fix. Next update here it should be fixed.