Unable to change NLS_LENGTH_SEMANTICS

I am currently trying to run a UTF8 enabled application on a Oracle 11.2.0.1.0 database, and have been having trouble storing some characters into the DB. I have been advised by the application support that the product can definitely do store them, and that I must set the NLS_LENGTH_SEMANTICS parameter to CHAR using the following statement;
ALTER SYSTEM SET NLS_LENGTH_SEMANTICS=CHAR SCOPE=BOTH;
However after logging into the target database as the "systems" user and running this statement, which runs successfully, querying the "v$nls_parameters" still shows that it is set to "BYTE". I have tried then creating a new database and setting this value to CHAR in the advanced settings, but still to no avail.
However after googling this and reading several articles I have began to notice some other strange behaviour. The first thing i noticed was the "SPFILE{dbname}.ORA" file contains the right value i.e;
*.nls_length_semantics='CHAR'
The second thing that I noticed was that running the "v$nls_parameters" query in SQL Developer produced a different result to the one produced by SQL Plus (See below) even though exactly the same user in the same database is being used. In SQL developer the following query "select * from v$nls_parameters where Parameter = 'NLS_LENGTH_SEMANTICS';" produces;
PARAMETER VALUE
NLS_LENGTH_SEMANTICS BYTE
1 rows selected
Where as in SQLPLUS this query produces;
SQL> select * from v$nls_parameters where Parameter = 'NLS_LENGTH_SEMANTICS';
PARAMETER
VALUE
NLS_LENGTH_SEMANTICS
CHAR
Can anyone provide any insight as to what could be the problem with my oracle database setup, as the application developers are adamant that UTF8 chars are supported and the only difference they can see between my setup (which doesnt work) and theirs (which does work) is the value of this parameter. Details of my system are;
OS: Windows 7 x64
SQL Developer: 2.1.0.63
DATABASE: Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE     11.2.0.1.0     Production
TNS for 64-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production

Forum for NLS / Globalization Support discussions:
Globalization Support
user10600690 wrote:
I am currently trying to run a UTF8 enabled application on a Oracle 11.2.0.1.0 database, Is this database created with db charset of AL32UTF8?
and have been having trouble storing some characters into the DB. What kind of trouble?
ALTER SYSTEM SET NLS_LENGTH_SEMANTICS=CHAR SCOPE=BOTH;
However after logging into the target database as the "systems" user and running this statement, which runs successfully, querying the "v$nls_parameters" still shows that it is set to "BYTE". I have tried then creating a new database and setting this value to CHAR in the advanced settings, but still to no avail. You've changed one parameter and looked at another.
There are different "levels" in what you wrote in the previous quote. Take a look at the dictionary views (http://download.oracle.com/docs/cd/E11882_01/server.112/e10729/ch3globenv.htm#i1006415)
NLS_SESSION_PARAMETERS (compare to v$nls_parameters, on which the view is based)
NLS_INSTANCE_PARAMETERS (alter system set nls...)
NLS_DATABASE_PARAMETERS (creating a new database...)
You may need to bounce the instance for the setting to have any effect (even with scope=both) for new sessions. At least I think that was the case in some previous release.
Note that I do not think you can (or, at least, should) create a database with semantics=char. The "advcanced settings" probably referred to instance parameters.
The first thing i noticed was the "SPFILE{dbname}.ORA" file contains the right value i.e;
*.nls_length_semantics='CHAR'Yes, the instance level view should agree.
>
The second thing that I noticed was that running the "v$nls_parameters" query in SQL Developer produced a different result to the one produced by SQL Plus Could be different client config/environment settings affecting session parameters. Compare with session level view.

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