The state information is invalid for this page and might be corrupted

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Hello,

I have an application that is working fine on our DEV machine (single box) but when i move it to our Test machine (two boxes) I am getting the following error when a form is posting pack.

<i>The state information is invalid for this page and might be corrupted.

[FormatException: Invalid character in a Base-64 string.]

System.Convert.FromBase64String(String s) +0

System.Web.UI.ObjectStateFormatter.Deserialize(String inputString) +72

System.Web.UI.ObjectStateFormatter.System.Web.UI.IStateFormatter.Deserialize(String serializedState) +5

System.Web.UI.Util.DeserializeWithAssert(IStateFormatter formatter, String serializedState) +37

System.Web.UI.HiddenFieldPageStatePersister.Load() +142</i>

I am using EP6 SP16, PDK 2.5, VS 2005. The application is making use of MultiView.

Does anyone have any ideas?