I don't know exactly when or why this was changed, but I noticed that on many settings dialogs a listbox has been introduced to switch to a different set of settings. For instance, on the compiler and debuger settings dialogbox, there is one to select linker settings, or toolchain executables.
I find this a step backwards from the tabbed design. It now takes two clicks to navigate. One to make the listbox drop down and one to select the proper topic, instead of the one it used to take to select the right tab.
And not to mention, you can no longer tell at a glance if you've selected the right dialog, because you can't see all the topics until you select the listbox.