Thank you for the update, Nephila, and thank you to the staff who are working to fix these issues.
I'm still having watchlist problems.
Edited: to add the inventory loading problem.
I have a problem!
My computer runs on: Mac
I use this web browser: Firefox
My Problem: I can only add one item at a time to the Marketplace watchlist.
My Problem: Inventory does not load for Trades, the Marketplace, or Sellback Store.