It looks like you are using an outdated browser version, which does not support some of the features required for Hallmaster to operate fully. You will likely still be able to use the system, but certain displays and features may not look or behave as intended.
We always aim to keep Hallmaster inline with the latest security updates and best practices, and we would strongly recommend you to update your browser where possible as this will improve both your online security and overall experience while using the internet.