Thanks for your quick answer! I appreciate it.
Unfortunately, it doesn't change anything.
Let me give you some information concerning the website:
Wordpress 3.4.2
I'm using the Origin 1.0 theme from Elegant Themes
I have a few plugins installed :
- Connections 0.7.3.1
- NextGEN Gallery 1.9.6
- Scroll Gallery 2 1.0.2
My guess would be a conflict with my template. Do you have the same problem with another template?