[@robin-w Moderator 12 years, 7 months ago]

Check other plugins

Check that no other plugins are affecting this.

Turn off all other plugins, and see if that fixes the problem. If the problem is resolved, add back one at a time to see which is causing the conflict.

Check themes

If plugins are not the cause, the it may be a theme issue. Switch to a default theme, such as twentytwelve, and test.

Once you have done this, come back if its still a problem.