1. Network problem: the menu bar does not display text, which may be caused by unstable network connection or cache problems. You can try reloading the page or clearing the browser cache to solve the problem.

2. Browser compatibility problem: If you use an old browser or there are plug-in conflicts, it may cause the CASS menu bar to display abnormally. It is suggested to upgrade the browser version or change to another browser with better compatibility, and check whether there are plug-in conflicts and other factors.

3. System failure: If the above two situations are not the cause, then it may be that the CASS system itself has failed. At this point, you can contact CASS customer service staff to reflect your problems and ask for help.