In Toad 10.6, when conecting to Subversion as a user without TC_ roles, the following error appears:
VCS provider logon failed: ORA-06550: line 1, column 58:
PL/SQL: ORA-01031: insufficient privileges
ORA-06550: line 1, column 46:
PL/SQL: SQL Statement ignored
In Toad 10.5.1, this works ok, with no error. The SYSTEM user doesn't have this issue, but if the user is granted all three TC_ roles, the error still appears.