In most cases, making sure you are on the latest version of HHStudio can solve this problem. In the software, go to Help > Check for updates.
If you are on the latest version of HHStudio and prices are not visible, make sure your prices are enabled. Go to Preferences > HHStudio Preferences. At the bottom, make sure enable pricing is selected.
If the computer you are using is not connected to the internet, HHStudio will not be able to access the catalog and provide pricing.