Fonts in menubar unreadable after upgrade

-- url of the page with the problem -- : n.a.
-- HikaShop version -- : 2.3.5
-- Joomla version -- : 3.3.6
-- PHP version -- : 5.4
-- Browser(s) name and version -- : all

While installing Hikashop Business on one of my sites, I noticed a short message about missing XML files, before the installation continued within Hikashop.
All still seems to work fine, but the menu's are displayed very funny. Unreadable fonts, etc

Hello,
Can you change the value of the "Menu position" option via "Hikashop->System->Configuration->Display" and test it again ?
Thanks.

Ok, that solved it. I remember I just upgraded this site recently from Joomla 2.5, so that's why the menu was in an odd position.
I also upgraded another site, and there all went fine. Also I did not notice the message about missing XML files.
Thanks.