Problems Inserting Data View as a Form

Is anyone else having problems inserting data views as forms into a Data Form Web Part with Sharepoint Designer 2007 RTM

I'm following the instructions as detailed on http://office.microsoft.com/en-us/sharepointdesigner/HA101191141033.aspx , but every time I insert my selected fields as a single (or mulitple) item form, it returns the following error:

<X>SharePont Designer cannot render the XSLT in this Data View. Try to undo your changes or re-insert the Data View.

Failed setting processor stylesheet : 0x8004005 : Expression expected. {ddwrt:DataBind('u',concat('ff1',$Pos),'Value','ValueChanged','ID',-->,<--'@Varname')}

I'm trying to insert data from a SharePoint List. It will work if I insert data as a list view, but not if I try to insert it as a form.

Any ideas would be greatly appreciated.