Hi,
When the QL is empty, it's a totally empty black window, with just the close button, title, and fullscreen icon. But this seems to be a Leopard bug: if I resize this window, the content is redrawn (with the default No-generator info).

With qlmanage -p, I get what I suspected: the document type seems totally wrong:

Previewing ...../quotes.tar.bz2. Content type UTI: dyn.ah62d4rv4ge80e8vw. Generator used: None


The archive is OK, I can extract it with tar jxvf.