Table headers disappear when shrinking font

We recently upgraded from 6.4.8 to 6.5.2 and now have a problem with the table headers, which did not appear before.
We are using the reindeer theme and when you have a table and then shrink the font in the browser (using Ctrl and -) suddenly the header texts disappear. You can even see this with the vaadin sampler, just select any table demo.
It happens on Firefox and IE8.

Any ideas on how to fix that?

we are also facing the same issue. i saw another thread about this but no one posted any solution. Please let us know if u get any solution.

Regards,
Nedu

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