BOL - Visual Database Tools - Dialog Boxes - Database Designer Dialog Boxes - Save Incomplete Dialog Box
"Invalid cursor state
Appears when Microsoft® SQL Server™ runs out of resources while attempting to save selected tables or a database diagram"

BOL - Troubleshooting - Error Messages - Error Message Descriptions - ODBC Error Messages
"In SQL Server Enterprise Manager, you may receive the "Invalid cursor state" error message when Microsoft® SQL Server™ runs out of resources while attempting to save selected tables or a database diagram. This error is returned because of insufficient space in your database or transaction log to complete the save process . To correct this problem, check to see if the database or the transaction log is full. If so, increase the size of the database to accommodate the change. Check other system resources or contact your system administrator"