[ELV1I2]

Originally Posted by Nico

That probably means that the variable is not set or empty. Are you sure the variable contains the expected content?

Also, enclosing the name in quotes may work.

PHP Code:

header("Content-Disposition: attachment; filename=\"$filename\""); 

Oh, thank you very much Nico, this part of code was in function that missed $filename as parameter. Also, enclosing the name in quotes helped.
You saved my afternoons and evenings by this suggestion.