questions about visual profiler why gld uncoalesced, coalesced.... are gray

Hi everyone:

I wonder why I cannot choose four options (gld uncoalesced, gld coalesced, gst uncoalesced, gst coalesced) when I use visual profiler. These four items are gray when I set the session settings. anyone has the same problem as me? My CUDA is 2.3, and my card is GTX280


And the answer:

:wacko: :wacko: :wacko: