After reverting to a database snapshot that contains Full Text indexes, it does not allow you to re-create Full Text catalogs until you either restart SQL Server Service, detach/attach the DB, or take the DB offline/ set the DB online.
We tried re-creating the FT catalogs in SQL Server 2008 R2 after restoring from the snapshot and this error did not occur.
Here is the error message we get in SQL Server 2012.
Msg 9972, Level 16, State 100, Line 1
Database is not fully started up or it is not in an ONLINE state. Try the full-text DDL command again after database is started up and becomes ONLINE.
Here is the SQL Server version number:
(Microsoft SQL Server 2012 - 11.0.2383.0 (X64)
Oct 5 2012 19:35:54
Copyright (c) Microsoft Corporation
Enterprise Edition (64-bit) on Windows NT 6.1 <X64> (Build 7601: Service Pack 1)