If you log in to Citrix and notice that only half of your programs are showing up, here's the new way to refresh your desktop (an updated version of this previous tutorial):
Step 1: Locate your "Citrix Receiver" icon in the bottom right corner of the screen.
Step 2: Right click on the icon and select "About" from the menu.
Step 3: In the window that pops up, click the down-arrow next to "Advanced"and choose "Online Plug-in Settings".
Step 4: Select "Refresh Applications" from the menu.
Hopefully all of your icons will pop up on the desktop again.