After upgrading to RE 7.91, RE instances installed on our Citrix servers refuse to run.  We get to the RE database selection screen, select the organization, and then get an error message "Access to The Raiser's Edge install directory and subdirectories has been denied.  User rights should be checked."  This happens when running as a domain admin.  Locally installed clients are working perfectly fine.  Anyone have any ideas?  Our Citrix deployment is critical.