I have just relocated a DNN installation from Win2K3 (x32) to a new Win2K8R2 x64 box. The database was also relocated to a SQL2k8x64 instance. The relocation was simply copy of the files and creation of the website - DNN V5.2.3

The stored procedure dbo.aspnet_Membership_GetUserByName is regularly called, but fails. The reason is that the DNN application is passing a parameter value @CurrentTimeUTC= '2010-04-17 05:46:20.1070000' and SQL is unable to convert this to a valid datetime. It's too long! The final four zeros 0000 cause it to fail. The error shown in the browser says 'Parameter count does not match Parameter Value'

I've tried running IIS in 32-bit mode; using classic rather than integrated pipeline. I'm assuming this is something to do with .NET x64, but have no idea where to go next to correct it. I'm assuming there is a simple fix to this, as I certainly do not want to modify the DNN core code or stored procedures to correct what is passed.