I have an ubuntu 13.04 gnome 64 bits, but since a few days I am facing serious problem for doing simple drag an drop : in nautilus, in eclipse, in the browser. Also I can't manage to select text areas with the mouse (the only way I found is to double click on the first word, then expand selection with shift and arrows keys).

I noticed that often, after having started a drag n drop, it is cancelled though I did not release the left mouse !

It is as if for each simple mouse clic : two was done !

My graphic card is an ati radeon hd 4330, and I had installed the default purposed driver.

I don't know if I should give you results from some terminal commands, as I don't know which could be useful.

Thanks in advance.