Can't copy pdf via drag & drop to iBooks
I wanted to copy some PDFs to my iPad via drag & drop and iTunes but I am suffering under the problem that nothing happens.
I even get not displayed a "+" on my cursor and everything I have tried, nothing is copied to the ipad..
iPad is running under iOs 4.3 and iTunes is up-to-date.
MacBook Pro, Mac OS X (10.6.7)