How weird that it works from a direct link .. Ok well thats a bug .. i will need to try to find time to fix that.. i will try to look at that soon .. however if you feel you wanted to have a look there are files under src folder depending on the pdf engine being used .. not sure if you have tcpdf or not .. but in ReportTCPDF,php in function , this code sets the pdf name
$attachfile = "reportico.pdf";
if ($this->reportfilename) {
$attachfile = preg_replace("/ /", "_", $this->reportfilename . ".pdf");
}
header('Content-Disposition: attachment;filename=' . $attachfile);
Ill need to change attachfile to work into a unicode format possibly... Ill have a think unless you have a solution?