Created a new database using deZign. The resulting script was run using IB_SQL, which reported "Script completed without exceptions".
Ran the script using my standard creation checklist, which can be viewed at http://secure.enw-ltd.com/dbCreation.html#ibsqlCreation. On committing there was an IBO hourglass icon for at least 30 s. Repeated the "Commit" action; this generated Windows-7 progress wheel, followed by the IB_SQL message containing the words, "ISC deadlock". Exploration of status details revealed inability to format a message. I will be rebooting and re-installing Firebird in order to address this error. On attempting to disconnect and/or close IB_SQL I got the prompt, "Please complete your transaction". In the meantime, if anyone can see any errors in the SQL script,I would appreciate knowing that. Script is available at http://secure.enw-ltd.com/create_firebird.sql.
