From the Denali Management studio, under SSISDB I Right clicked Integration Services and selected create catalog, typed a password, hit OK and got an error
TITLE: Microsoft SQL Server Management Studio
Cannot open backup device 'C:\Program Files\Microsoft SQL Server\MSSQL11.MSSQLSERVER\MSSQL\DATA\..\Backup\SSISDBBackup.bak'. Operating system error 3(failed to retrieve text for this error. Reason: 15105).
BACKUP DATABASE is terminating abnormally. (Microsoft SQL Server, Error: 3201)
During installation I set the default backup location to C:\Databases\Backups so (even ignoring the .. that somehow found its way into the backup path) that folder does not exist
It appears that the Create for the catalog is simply using the default backup location, ignoring the possibility that it may have been changed.
In addition, selecting the Script option on the Create Catalog dialog produces a query window that simply reads
With no actual script for creating the catalog appearing