MS Sql 2005 and prepared queries

Hi,

I am new to the list. I have been meaning to try out this project for  
a while and have finally made the time.

I have managed to connect to our SQL 2005 server using unixODBC and  
the latest stable version of FreeTDS. I have been writing a program  
using Qt4 in windows and am porting across to Linux, it makes  
extensive use of prepared queries.

I can't seem to get these to execute under FreeTDS, is this supported  
yet?

I get am getting the following errors in my odbc log:

[[FreeTDS][SQL Server]Invalid data type]

Any guidance would be greatly appreciated.

Royce