The current title usually scrolls when it's too long.
Very often it happens to me that the scrolling suddenly stops (after completing the current "round"). But it's still in scrolling mode (fades out instead of showing an ellipsis).
When I double-tap on the title it says the scrolling is now disabled. When I double tap again scrolling works again. But not for long - then it stops again.
Android 4.3 on Samsung Galaxy Nexus