Hi,

on the site http://www.gbs-mozaiek.be when opening in Firefox there's no menu, in Chrome I can barely see it, in Safari hardly visible (and a question mark for the image). Upgraded Montezuma to latest version.

It looks like your menu is above the top margin. I did a firebug, and it's there. Your positioning is off. I don't have that code anymore, so I'm not sure what it's supposed to look like. Maybe you can save your current header.php as header-bak.php, reset header.php to the default, see what's different, and you might be able to figure it out. Did you make any custom css?

JerryC, thanks a million, that worked like a charm.
Made the backup as you so rightly suggested, but resetting was enough.
And no, no custom CSS or anything else, and I can't suspect the update of Jetpack (which is all that changed the last days).