I upgraded to Lightroom CC last week, I was looking forward to work on ARW files directly.
The first time I imported them it all worked out, it was able to read them and I was happy to enjoy the automatic lens correction features finally.
However after that, every time I tried to import other ARW files it didn't read them anymore, just like my older version of lightroom.
What could be the problem? it's very weird, anyone else had it?
Versione Lightroom: CC 2015 
but when I check for updates in the creative cloud it tells me that it's already updated!
Well CC 2015.0 is out of date and the update report is wrong.
Try manually updating to 2015.7. Click Lightroom 6 then download the updates manually.