Yo guys i had the same problem and it's from " lock Items on Desktop" ......................... BUT ............... that's because it's active from somewhere else !!!
all you have to do is the following :
right click on the dest top > propertise > desktop tap > click on customize disktop > web Tap > on the web pages white box uncheck all the marks > ok > ok and you are done
after that make sure that the use drop shadows for icon labels on desktop is checked on
and have fun
