Pretty much all summed up in the title. Will add additional information when available. Basically various keyboard menu commands wont work. Ladder , Character, Inventory etc. But when i click the join/leave chat button multiple times it seems to solve the issue.
I’ve found related issue - Clicking on open chat elements with left mouse button cause related character action (in default move). It might be very annoying when you want to scroll to a specific message and read it more carefully - your character might get into the trouble(s)… Mouse actions should be more accurate region-clip routed as in example clicking on some region of inventory.