Drupal 8 Admin Primary Tabs Completely Disappeared -

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i'm building site in drupal 8, , pushed code local our development box, , on development box, admin primary tabs have disappeared. everywhere. following screenshot of issue.

http://i.stack.imgur.com/nb6sp.png

the code version controlled (git), , databases identical. there no outstanding configuration changes synchronize either. i'm pulling hair out trying figure out issue is. there settings somewhere i'm missing? i've tried logging out, clearing cache, different browser. nothing. wanted second option before submitting issue report on drupal.org.

i don't know why configuration identical when shouldn't, think admin theme not have "primary tabs" blocks in header, can check production env block layout , see if infact "primary tabs" block there (admin/structure/block/list/seven).


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