[LH2645] Navigate / Go To / Next Document: Keyboard shortcuts trigger split screen

The keyboard shortcuts for Navigate / Go To / Next Document [ALT+SHIFT+DOWN] and Navigate / Go To / Previous Document [ALT+SHIFT+UP] open those documents in a split screen.

This appears to be the behaviour associated with Alt Up and Down, without the Shift key. Are you having problems with any other Shortcuts that include the Shift Key?