For me both \maketitle and \makecvtitle works fine. Have you set in the preamble something like this?:
\moderncvtheme[blue]{classic}
% possible themes are "classic" and "casual"
% optional argument are 'blue' (default), 'orange',
% 'red', 'green', 'grey' and 'roman' (for roman fonts,
% instead of sans serif fonts)
\firstname{Long John} % required
\familyname{\\Silver} % required
\title{Curriculum vitae} % optional
\address{Treasure Island}{Pacific}% optional
\phone{555555555} % optional
\mobile{555555555}% optional
\fax{+43(0)999 7777} % optional
\email{ljsilver@treasureisland.com} % optional
\extrainfo{Pieces of Eight!} %optional
\photo[2 cm]{silverface} % optional
\quote{"Stand by to go about"} % optional
moderncvLyX template/layout file? – Werner Sep 9 '12 at 2:08