Performing an upgrade from Shopp 1.1.x to Shopp 1.2.x by dragging and dropping via FTP (thereby overwriting) files will leave a mix of old Shopp files and new ones.
Inability to access certain areas of Shopp within the WordPress admin.
Fatal error: Call to a member function text() on a non-object in /home/sitename/wp-content/plugins/shopp/storage/core/FSStorage.php on line 171
Shopp Version: 1.2.x
WordPress Version: 3.0
PHP version: 5.x
Web Browser: IE7/IE8/FF3/Safari5/Opera10
Web Server: Apache/IIS/Lighttpd/Nginx
Server OS: Linux/Windows
A drag and drop upgrade from Shopp 1.1.x to Shopp 1.2.x
Complete a manual upgrade as described in the article below: