Zero Padding Culprit

I have a Windows Forms Application that communicates with an embedded client
using custom messages over a UdpClient connection.

Everything was fine until the Windows machine was upgraded with service
packs.
After installing WinXP SP2 and .Net Fx 1.1 SP1, something started zero
padding my messages (verified by Ethereal). The embedded client doesn't
expect these extra bytes.

Does anyone know what software component is zero padding my messages to a
multiple of 32 bits? Is it WinXP SP2, Fx 1.1 SP1, or something else?

Thanks for your help, Jeff




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