Concrete5 Menu Bar missing after update to 5.6.1 (css problem?)

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After updating from 5.6.0.2 to 5.6.1 the C5 Menu Bar is gone. The menu appears as an menu on the left (see 1st screenshot). I guess it's a CSS conflict?? To see if it's nothing conflicting in the theme's css, I cleared the whole css, but still no Menu Bar. (see 2nd screenshot).

Any suggestions?

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