Getting SlowAES and RijndaelManaged class in .NET to play together

I'm trying to setup AES encryption / decryption using the javascript library SlowAES and the RijndaelManaged class in .NET.

I chose this method after reading this post, where Cheeso has managed to get these two encryption methods to play together

"In my tests of the COM-wrapped-SlowAEs, I used CBC mode, and the encryption was completely compatible with the RijndaelManaged class in .NET" - Cheeso

I've taken the javascript code from Cheeso's Windows Scripting Component, the latest slowaes libraries, and using the following javascript script to test:

var key = "12345678901234567890123456789012";
var message = "watson?";
var decrypted;

slowAES.aes.keySize.SIZE_256;
slowAES.modeOfOperation.CBC;
put_PassPhrase(key);
var result = EncryptString(message);
decrypted = DecryptCommaDelimitedStringToString(result)
document.write("Key:" + key + "<br />original:" + message + "<br />Cypher:" + result + "<br />Decrypted:" + decrypted + "<br />IV(): " + get_IV());

I'm getting the following output:

Key:12345678901234567890123456789012
original:watson?
Cypher:245,159,1,1,168,1,1,143,1,1,146,1,1,239,117,1
Decrypted:watson? 
IV(): 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0

I've modified the following example found on MSDN to try and match the encryption in C# :

public static void Main()
        {
            try
            {
                string original = "watson?";
                byte[] IV = new byte