Interaction between TWS and MacOS 12 (Monterey)

The present article addresses performance on the Trader Workstation (TWS) under MacOS Monterey (version: 12), as experienced by several clients. The TWS may experience freezes or may shut down unexpectedly (crash) when running on MacOS 12. This can happen immediately during the TWS start up phase or may occur at a later time point, after some minutes or even hours.

Fix Implementation

A fix has been released in the TWS Beta, available for download here

Background and additional details about the resolution of the issue
This behavior did not depend on the Trader Workstation, but was caused by a bug in the code of the official Oracle Java platform which is bundled with TWS and used to run our software. Since the Oracle Java platform belongs to Oracle and we (IBKR) could not modify its code or functionalities, we had to explore alternative Java platforms to use (e.g.: OpenJDK, Azul) as we saw this as the only feasible way to provide our clients with a fix for the above issue within a reasonable time.

This process included an extensive amount of testing, in order to see which of the alternative Java platforms was the best fit for the Trader Workstation and as well to avoid introducing new issues while solving the current one.

We sincerely thank you for your patience.