It's worth noting that the mailbox functionality still works just fine, e.g., shift-clicking a mailbox entry will open it and auto-remove all items; it's only the mouseover events that are problematic, and only when there's at least one item attached to the message.
Opening the mailbox worked fine, but moving the mouse over any particular mail item triggers this:
It's worth noting that the mailbox functionality still works just fine, e.g., shift-clicking a mailbox entry will open it and auto-remove all items; it's only the mouseover events that are problematic, and only when there's at least one item attached to the message.