Dell Display & Peripheral Manager v2.1.0.24 Bug

Is someone really testing software before release any more? I have Dell Mouse & Keyboard Set (KW7321) which ı have been using seamlessly until Dell decided to make things complicated by merging Dell peripheral and Display software. My mouse have two side buttons. When I configure them to Windows Multimedia Actions Volume Up and Down as before it shows as if they are assigned but they wont function as expected. They are still operating as back and forward for the browser no matter what I do. I hope someone fixes this.