There are two problematic hotkeys in Ocelot:
<Accelerator>-Shift-Tab, which cycles to the next pane in the window
<Accelerator>-Tab, which focuses the segments pane
On Windows, <Accelerator> is Control, which is fine, since these keystrokes are unused (Alt-Tab and Alt-Shift-Tab are used for application cycling).
However, on the Mac, <Accelerator> is command, and Command-Tab/Shift-Command-Tab are system-level commands to switch between open applications.
One option is to change this hotkey on the mac (for example, force it to use Control, which would be consistent with Windows). The other option would be to change the hotkeys for all platforms to something safe.