Hello. Quite often some buttons/options in BS UI can’t be trigger. Exmpl: Panel Option > “Source URL”, at the same time there is no problem to write URL via Panel HTML/Attributes (key-value) or double click on object in Project Window. This is especially true for the panel “Options”.
You might want to add your OS info so they know which version is having this issue. You probably should have posted this in the Bugs forum rather than the help forum too. Welcome to the forums and hopefully they can get that working right for you.