I love the Graphene theme! However, after I recently updated the theme version, Firefox v26.0 doesn't show the drop down arrows in the menu any more on my website. Instead, Firefox now displays a strange character that looks like a square with "F4 31" text inside. I am using a child theme, so perhaps could there be an incompatibility between my original child theme and the new version of the Graphene parent theme?
The problems sounds similar to this one but I'm not using Graphene Mobile.
For example, see Training Events and About Us menus on my website: http://www.hadoopwizard.com
Thank you in advance for any help or guidance on how to fix this on my site.
Kudos for your awesome work on the Graphene theme!