Hi
Sorry but It's not clear for me what do you mean?

Hi
screen.cpp:297
CopySymbol(sprite_buffer, font_digit_6x8, BIG_COLON + (secs & 1), POS_COLON, 0, 6, 8, 2);
It's need just change this line with:
CopySymbol(sprite_buffer, font_digit_6x8, BIG_COLON, POS_COLON, 0, 6, 8, 2);

If you want to have symmetric dots then you need to edit existing symbol or add new one:

screen.cpp:170 change this:
" 0x46, 0x46, 0x00, 0x00, 0x00, 0x00 //':' 0xb
};"
with this:
" 0x46, 0x46, 0x00, 0x00, 0x00, 0x00, //':' 0xb
0x66, 0x66, 0x00, 0x00, 0x00, 0x00 //':' 0xc
};
#define BIG_COLON2 0xc"

And change symbol code BIG_COLON with BIG_COLON2 in above function call.

Hi
Sorry I don't understand what is mean: "flashing seconds" ?