Revit Unspecified Error

Over the last few days there has been a number of errors within Revit (Architecture, Structure and MEP) when doing common tasks, showing up in the form of an "Unspecified Error" to be exact.

Some of these problems include:

• From Revit 9.1 - When trying to save Groups to .rvg file types
• 2008 - Editing of Groups
• 2008 - Opening legacy files in Revit Architecture 2008
• 2008 - Saving a view out of the project browser to an external file (also found schedules to be an issue)
• 2008 - Creating a project without a template.
  

How to fix:
Its a hack but its what we have right now; set your system date to be either before January 01, 2008 or after January 31, 2008.

Update:
Autodesk staff are aware of these issues and are working on a permanent fix for this.