Yabdab problem BootSnap3

I am a new user of RapidWeaver 6.3.6
I Maverick as the operating system on my mac.
I bought and installed
BootSnap3 Addon Kit # 1
BootSnap3 Addon Kit # 2
BootSnap3 Starter Kit

I see the stacks in the library rapid, put them in my layout but I remain gray and can not operate. Why?
Of course I use the theme BootSnap

Thanks for the help

My screenshot