Unfortunately the latests version of Citrix Workpspace software is not compatible with Unity, the current workarounds are:
Uninstall Citrix Workspace
Re-Install it from Command Prompt using the following command:
CitrixWorkspaceApp.exe ADDLOCAL=ReceiverInside,ICA_Client,AM,SELFSERVICE,DesktopViewer,Flash,Vd3d,WebHelper,BrowserEngine
or
Downgrade to an older verison of Citrix Workspace