01 Jun 2015
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This bug: http://www.sitefinity.com/developer-network/forums/general-discussions-/add-new-page-error that was fixed in 2011 is back in the wild.
The error message is:
There was an error deserializing the object of type Telerik.Sitefinity.Modules.Pages.Web.Services.Model.WcfPageContext. The value '' cannot be parsed as the type 'float'.
The fix is to include a value in the "Priority in sitemap" field, but there should be validation there to prevent form submission.