I can log into Citrix but when I double-click on an application, I get a blank white or gray screen.
Delete your temporary internet files and cookies in your internet browser.
i. Close all browser windows.
ii. Open a fresh copy of your Web browser.
iii. For Internet Explorer, Go to the Tools menu -> Internet Options -> General tab and looking for the Delete button.
Other Web browsers usually have this command under the Preference Menu, typically called "Cache files" or "Empty Cache"
iv. When it is has completed the deleting process, close the browser window, reopen and try again.
If you recently installed a second 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.
10th of October, 2012