CPSplitView resize cursors now require [[self window] setAcceptsMouseMovedEvents:YES]; to be called manually pending a CPTrackingArea based implementation.

AppKit/CPSplitView.j

@@ -405,7 +405,8 @@ var CPSplitViewHorizontalImage = nil,
 
 - (void)viewDidMoveToWindow
 {
-    [[self window] setAcceptsMouseMovedEvents:YES];
+    // Enable split view resize cursors. Commented out pending CPTrackingArea implementation.
+    //[[self window] setAcceptsMouseMovedEvents:YES];
 }
 
 - (void)mouseEntered:(CPEvent)anEvent