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That is the exact problem! The #! needs to be the exact first two characters. Otherwise it is a comment and it gets ignored...
So therefore the default shell got called instead which is /bin/sh...

Was just going to edit, but since its a new page i'll do a new post.

What i've forgotten to add was this, use quotes when checking for empty string.
[ -z "$1" ] && ...

That way it will not...

Try using [ expr ] instead of [[ expr ]].
Just had the same thing when running a script.

The script using #!/bin/sh whose test builtin probably does not know -nt (I presume /bin/sh points to dash). Try using #!/bin/bash instead..