The Leonardo uses a different USB to Serial converter chip from other Arduinos. This one appears to need the DtrEnable flag (Data Terminal Ready) set in order for communications to occur.
My code had it; why I can not remember. MikMo's (and most other) code does not, because it has not been necessary, until now.
MikMo added it to his code. His code is now able to talk to the Leonardo.
It's time, I think, for you to open the other threads we talked about, mentioning your inability to communicate with the Leonardo. Reference this thread, so the fix needed is obvious. I'm sure that quick turnaround will be possible on the other code will be made, too.