Customizing the application.master file in SharePoint 2007 may result in some errors

Be carefull when customizing or branding the application.master file. You may get som strange errors, for example:

"Application error when access /_layouts/mngfield.aspx, Error=Unable to validate data. at System.Web.Configuration.MachineKeySection.GetDecodedData(Byte[] buf, Byte[] modifier ..."

I got this one when I tried to make changes to a field on a list (mngfield.aspx).

The reason in my case whas that the master page included a statement. When I removed this one I was up and running again.

Others have discovered the same error: Read here

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