The engineers are still working to resolve the issue.
There is, however, a workaround for staff who are on campus. This will not work for staff working remotely from home.
To access citrix, please type the following address into your browser:
This should give you access to the Citrix Receiver Page
Click on the Install button
Then click on Already Installed
You should then have access to the citrix environment and your applications.
Once again, apologies for the inconvenience this may be causing.