Due to a problem in Quartus® II Software version 14.0, the Rapid Recompile option may be grayed out. This option is in the Quartus II menu Processing > Start > Start Rapid Recompile. This problem affects designs when the top level project name and revision name are different.
To work around the problem, use the command-line option
quartus_sh --flow recompile <project> [-c <revision>]
This problem is scheduled to be fixed in a future release of the Quartus II software.