I've been using Magento for a while, but somehow I screwed something. Some functions aren't working well (for example, the "Flush CSS/Javascript" buttons are gone, the shipping cost isn't shown on the Checkout Review, and some other weird issues.
I would like to make a fresh install, only keeping my template files, and everything else clean, but keeping my data. As far as I know, this is not possible only with Magento export options (only products and customers). I have some extensions with data I would like to keep and of course the categories and main configs.
Is there a way to do this without having to manually add the new data?