This issue started sometime in late November/early December 2025. The issue has been observed on all stock symbols having one or more open sell orders, after cancelling orders on IBKR brokerage production account. Steps to replicate issue in MS Edge browser In the left panel, click Dashboard and then click Broker name Search for a ticker and click dropdown to load page for symbol In the Open Orders section, click an order to expand the order details, revealing a Cancel button Click the Cancel button then click popup to confirm Cancel Order The order is cancelled as expected; however a 404 Page Not Found error is displayed <-- THIS IS INCORRECT (see attached) Click refresh to reload the page for the symbol, or click "Back to Dashboard" button to start over at step #1. WORKAROUND: Instead of expanding the open order (Step #3) and clicking the cancel button (Step #4), use the checkboxes to select one or more orders and then click the Cancel button that appears in a popup menu below. This cancels the order and refreshes the page without displaying the 404 page not found error. Please look into this issue. I'm using page refresh and the checkboxes as a workaround for now. Thank you!