Bug Fixing (Import/Export and Picture Upload) - Magento

Hi there, I own the following website [login to view URL] (auction website). However yesterday the website started to give the following message when I upload new products (from a xml file) using the Import/Export feature. Please wait while the indexes are being refreshed. An error occurred while finishing process. Please refresh the cache. <<<<<< I tried to refresh the cache but nothing happend. Due this problem my website is now unable to show the products that were imported by the Import-Export feature (but it do show new products that I create at the admin. My other problem is that when I try to create a new product, the website does not load the pictures that I try to upload. Can anyone help me ?