What version of RapidWeaver are you using?
What version of the Stacks Plugin are you using?
What version of the Foundation Theme do you have?
What version of the Foundation Stacks do you have?
I am having no issues at all.
Also, if it was last week, there was a big issue that brought us from 1.5.x to 1.6.x, and a lot of people did not update the theme. The stacks latest version is 1.6.5 and the theme is version 1.6.2, if you did not get the theme (which is not updated by RapidWeaver but you can get with Waterfall plugin by Nimblehost - http://nimblehost.com/store/waterfall/) then you would see MANY issues with 1.6.5 stacks and 1.5.x theme.