I have just started with Citrix not to long ago, we are running W2k sp2 and Citrix XPe fr2. In the event log our published applications are getting this popup message. Any ideas where to start looking. It does this on more then one server and with different apps also. Event ID: 26 / Application popup: Preactor Protect: PrSetupEx.exe-Application Error: The instruction at "0x77e84310" referenced memory at "0x00000013". The memory could not be "written" Robert Nicklas