Not generating pdf file with wkhtmltopdf

Hi there,

Up to version 6.x-1.8 everything was working fine. I got into trouble from version 6.x-1.9 on. The pdf file generation with wkhtmltopdf and Xvfb is not working any more. It seems like something has changed in the module.
I'm running Ubuntu 8.04 with the distro's Xvfb and the newest wkhtmltopdf. A test from the command line generates the pdf just fine. There are no errors executing Xvfb :0
De drupal log entry tells me that the pdf has being generated but on my browser's page nothing happens, just a page reload. Looks like a bug to me. I had to downgrade to the last working version 6.x-1.8.

Anyone else experiencing this problem?

Cheers!