After launching Revit 2009 64-bit products you receive an Unable to obtain a floating license error at the Recent Files page.
Revit 2009 64-Bit products can require up to 30 seconds to acquire communication with the network license server. If you receive an Unable to obtain a floating license error at startup close Revit. Launch Revit and wait 30 seconds before opening or creating a new project file.
Products: Revit Architecture;Revit MEP;Revit Structure