Writing Large Objects to Postgresql via ODBC using VB

I am having problems writing to a postgres database using ODBC. Here are
the steps I have taken:

1. I have greated a lo type in the database

create type lo (
internallength=4, externallength=10,
input=int4in, output=int4out,
default='', passedbyvalue
);

2. I create a table in the database

Create table matt ( matt_id integer not null unique primary key, matt_text
lo );

3. I have a simple form with 1 rich text box, RichTextBox1 and a command
button Command 1 Here is the code on the form:

Private Sub Command1_Click()

Dim query As rdoQuery
Dim rst As rdoResultset

Set query = cn.CreateQuery("Add_Pic", "select * from matt;")
Set rst = query.OpenResultset(1, 3)

rst.AddNew
Save_RichText RichTextBox1, rst![matt_pic]
rst.Update

End Sub

Public Function Save_RichText(TextBox1 As RichTextBox, WhatField As rdoColumn)

Dim DataFile As Integer ' Free File Number fo Reading
Dim Fl As Long ' Length of the File
Dim Chunks As Integer ' The Number of Chunks
Dim Fragment As Integer ' The Size of the Remainder
Dim Chunk() As Byte ' To hold each Chunk
Dim I As Integer ' Variable for For Loop

Const FileName = "c:\tmpsavetext.rtf"
Const ChunkSize As Integer = 1024

TextBox1.SaveFile FileName, rtfRTF
DataFile = FreeFile

Open FileName For Binary Access Read As DataFile
Fl = LOF(DataFile) ' Length of data in file
If Fl = 0 Then Close DataFile: Exit Function
Chunks = Fl \ ChunkSize
Fragment = Fl Mod ChunkSize

'Put Null into Field
WhatField.AppendChunk Null

'Get the Fragment
ReDim Chunk(Fragment)
Get DataFile, , Chunk()
WhatField.AppendChunk Chunk()

'Get the Chunks
ReDim Chunk(ChunkSize)
For I = 1 To Chunks
Get DataFile, , Chunk()
WhatField.AppendChunk Chunk()
Next I

Close DataFile
Kill FileName

End Function

What is wrong with the above. when I run it i get the error:

S1C00: Only SQL_POSITION/REFRESH is supported for SQLSetPos

I am running postgresql 6.5.3, PostgreSQL ODBC Driver v 6.50.0000 and am
using vb 6.0 Enterprise. The postgresql was installed from a rpm and is
running on RedHat 6.2

Any help would be greatly Appreciated.

Matt Dormer