Erroneous table DDL generated by TOAD
If you run a "Create Table" script with Tablespaces and LOBS, the table is created successfully. However, if you then go to Schema Browser|Table|Script and view the script created by Toad you may find that it is incorrect and the LOBS end up in the incorrect tablespaces.
WORKAROUND
Copy the script which you created yourself and paste into Schema Browser|Table|Script so you may rerun this correctly.
STATUS
Waiting for a fix in a future release of Toad for Oracle.