C# scripts - unity ok - android not recognized

i´m making a 2d game for android.
im developing the Menu based on GUI classes

on Unity it works very well but, on Android, the buttons and labels don’t appear

no erros in the build process.

i think the C# scripts could be not working.
they are attached to main camera and make whole layout
i put a sprite and it appeared but the button does not

what should i do?

i´m loading data from a XML file.
the path that I put runs on the PC and not on android

thanks jamora.
when you said “absolute positions” i remembered the “absolute path” could be the problem