If you recently updated your computer with a new operating system or a new Web Browser, you should install the latest Citrix Client.
Re-install your Critrix client. Follow this link to learn how.
If you recently installed a second monitor or new monitor, try this:
i. Logout of Citrix.
ii. Disable the secondary monitor.
iii. Log in to Citrix and try running application. If it runs this time, you should be able to re-enable the secondary monitor.
iv. If you have large monitors, try temporarily reducing the resolution of your monitor(s) to something around the middle of the resolution scale to see if your apps will launch.
9th of October, 2012