Same here. It worked originally when I first loaded Cydia...got my full list of previously installed tweaks and everything. Installed FolderEnhancer and NCSettings, then went to install Springtomize and it can't load my account, so it can't see I've previously purchased it, AND I couldn't purchase it anyway. Going to my account shows nothing. My guess is the account servers are just massively overloaded at the moment. I'm not going to worry about it unless I can't access it for several hours.