This is not a bug in the menubar. We've changed the behaviour of the menubar, because previous versions (prior to version 9) had serious displays problems on some browsers and specific computer configurations.

Previous versions of the menubar used fonts in points, the new version uses pixel sized fonts for improved compatiblitity with the latest web standards and to make sure it looks the same on all computers.
Please update the style of the menubar to the desired value and it should be ok.

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