How to get MRU order on Task Switcher on Mac with Default Alt-Tab

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http://superuser.com – The default order of tasks in Mac Application Switcher is not entirely clear to me. It is in any case not the order of most recently used apps. In particular to navigate to the prior app it is not a one-touch / no -look operation. Witch can provide an alternative, and I use it. But I prefer to use the default task switcher in some cases. So this question is not a "general purpose" one about how to get MRU. It is specifically: how to achieve MRU in the default tab switcher This was workihg for me before I did a recent reboot but I can not determine how to reconfigure to achieve this behavior (HowTos)