Invalid length for a Base-64 char array

Hello,

I'm getting the following error back from a central error handling routine in the global.asax:

Exception Message: Invalid length for a Base-64 char array.
Exception Source: mscorlib
Exception StackTrace:    at System.Convert.FromBase64String(String s)
   at System.Web.UI.LosFormatter.Deserialize(String input)
   at System.Web.UI.Page.LoadPageStateFromPersistenceMedium()
Exception TargetSite: Byte[] FromBase64String(System.String)

I've seen other postings for this exception, but none have been helpful. It seems to be related to viewstate, but in this case, the stack trace doesn't event tell me the source page, so I don't know where to begin troubleshooting this.
LloydMcAsked:
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aprestoConnect With a Mentor Commented:
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aprestoCommented:
how are you creating the base64string that is being passed in?
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LloydMcAuthor Commented:
apresto,

The base64 string is created by an query string encryption(DES) routine. Some further research revealed that the DES encryption method places "+" characters in the encrypted data and these get parsed as empty strings when the string is decrypted. I changed the decryption method to replace any empty strings with "+", but we're still getting the errors.

What's so maddening is the stack trace isn't telling me what page or process the error occured in.
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aprestoCommented:
if you base64string has + or " ", get rid of them, If you havent done already you can use .Replace to do this:

MyBase64String.Replace("+", "").Replace(" ", "")

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LloydMcAuthor Commented:
apresto,

I am replacing any empty spaces in the decrypted string with "+" chars, but we're still seeing the error, although we can't reproduce it.
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