LabVIEW 2010 f4 patch has just been released. This patch mainly targeted several issues that a user could have hit when trying to create a web service in LabVIEW. Because of this it is recommended for users who will be creating web services in LabVIEW. More details can be found in the LabVIEW 2010 f4 Patch Details.
All of the fixes that went into this patch are included in LabVIEW 2010 SP1.