#1 Combining 3 Duepuntozero faces results bad TTC for Mac OS X

[suzuki toshiya]

http://www.dafont.com/duepuntozero.font
provides 3 fonts (Duepuntozero, Duepuntozero Bold, Duepuntozero Black -
the personal modification is permitted but redistribution is prohibited).
Combining any 2 TTFs results working TTC that FontBook validates OK,
but combining all of 3 TTFs results unworking TTC that FontBook finds serious
error in "System Validation".

[suzuki toshiya]

screenshot of FontBook validation