There is an orange bar in the top-left mini-calendar preview. I would suppose it highlights the currently displayed week. However, if I click on a different week, it does not update - therefore it effectively highlights the current week, all the time.

It's very confusing. In other clients, such graphical representation is usually used for marking the selected week. At first I though that week switching did not work. Only after some time I realized that I can switch weeks, just the orange bar does not update.

Please use the orange bar to display the currently selected week.