This issue can be caused by an inaccessible license server and may occur more with organization's who have employed a terminal server setup or the user may have an issue with local RDP licensing. To troubleshoot the issue, please see Citrix documentation here.
 
Please note:
  • we provide links to third party information in an effort to assist in any way possible; however, Blackbaud can neither verify nor troubleshoot the validity of the information contained therein. 
  • Incorrect changes to registry settings can cause serious system problems that may be irreversible without reinstallation of the operating system. You must back up your registry before making any registry changes. We are not responsible for damage resulting from incorrect use of the Registry Editor. Citrix documentation on this issue advises only an administrative login can make required changes to the required registry keys.