php odbc_exec problem

Hello everybody,
 
i have a problem with the odbc_exec function in PHP. But first our environment:
- Red Hat Enterprise Server 5.2 (32.Bit) with 64Bit processor
- unixODBC 2.2.11
- FreeTDS stable version available at the 16.12.2008
- MsSQL Server 2005 Enterprise 64Bit.
 
I've already written an email to the unixodbc support and they mentioned that this should be a driver problem (See bottom of this e-mail)...
 
The problem is, that i can't execute any statements using parameter bindings. If i include the parameters into the query directly i get the expected results. If i pass them to odbc_execute as an array i only get the following error:
 
odbc_mssql error: [00000: °     ±ÿÂ] in EXECUTE("select  top 1 * from master.Importstatus WHERE importer=? order by id desc")
 
The odbc_prepare() before returns a valid statement resource.
 
The id 00000 normaly means that the query could be executed successfully (then why is it issuing tihs error?).
 
This is (a part of) the freetds.config:
[global]
        # TDS protocol version
        tds version = 8.0
 
This is (a part of) the odbc.ini:
 
[TransactionHub]
Driver          = FreeTDS
Server          = ###
Port            = ###
Database        = ###
UID             = ###

I'm developing the same application under my own windows (i have to use it...) environment and everything works fine. When i copy it to the enterprise server using linux i get the descibed error.
 
So any help would be greatly appreciated.
 
Thank you.
 
Marcus.
 
Reply from unixodbc support:
 
>>RedHat is 32Bit:
>>2.6.18-92.1.18.el5xen #1 SMP Wed Nov 5 09:30:07 EST 2008 i686 athlon
>>i386 GNU/Linux
>>The Processor can also work with 64Bit software:
>>grep flags /proc/cpuinfo includes "lm"
>>So i have to ask the freetds support (right?)...
>That would be my suggestion