Upgrade from 5.1.4 to any version leads to design failures

If i upgrade to any other version than 5.1.4, plone loose the site navigation.

before:

after:

No idea where to change the configuration to get back the site navigation.

Hope someone can help me.

regards Manfred

Since nobody else has answered I make a wild guess:

Does it help if you reinstall the barceloneta profile in /portal_setup ?

(disable / (re) enable the theme afterwards.

PS: Have you customized anything TTW before migration (for example in /portal_skins/custom )

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