Only one user can user Crystal Reports for Blackbaud at a time.  Refer to What is the licensing agreement for Crystal Reports version 8.5? (BB86090) for additional information.

Note: The backend connection to the Crystal Reports license takes about two minutes to release. Please wait two minutes after the last exit of Crystal Reports before re-opening Crystal Reports. If the Citrix user that accessed Crystal Reports logs off of the Hosting Server, the license is released immediately.