ITunes cannot transfer movies bought from the Store onto the iPad.

Question

I have an iPad Mini and iTunes cannot transfer movies bought from the Store onto the iPad.
'Manually manage videos' is ticked but then after each sync attempt it goes back to being unticked.
'Sync only checked songs and videos' is also ticked and remains so.
When I choose the movies to put on the iPad, it gives me an indication of how much space I have (enough), lets me sync and then goes back to zero.

Answer 1

thanks jolieteddie, 
FYI, I searched the side pane here after asking this question.  It seems someone gave an answer that worked for me.  I could not drag and drop a pdf from the desktop into iTunes or the Ipad2 directly for whatever reason.  However in iTunes on the main menu under Files>Add, I could navigate to the desktop and add the pdf that way, then sync Books with the iPad. This worked!
I've attempted in the past to drag and drop videos, etc into iTunes and the iPad with no success. Somehow it never occurred to me to add them this way. Doh!
Good tip.