Can't remove app icons from the desktop I installed AdwLauncher. In the beginning it worked well. 

But now, I can't delete the app icons from the desktop.

The situation is that when I longpress the desktop, the list doesn't show up so that I can't add shortcuts, apps or widget to the desktop.

Also, when I longpress the app icon on the desktop, list doesn't show up so that I can't remove, delete or edit the icon.

My cellular is HTC Desire. Is this a bug problem or I just set up in a wrong way?

Restarting the phone didn't help. 

I used "home switch" to change the launcher back to HTC sense, then changed back to ADW but it still remains the same.
Have you accidentally locked the Desktop?  The option to "Unlock Desktop" should be on the Menu (possibly under the "More" option).