I'm on the paid tier and I regularly receive 'Error' window popup when viewing items in the Economy (the full list), or when I try to add items to a bundle (I only have around 110 items).
If I look at the chrome debug I see that either the Picker call or the All call recieves 500 internal server error.
Sometimes refreshing fixes it. Othertimes I have to refreh 20 times. Othertimes I just give up.
Makes it really difficult to use the dashboard