URGENT: Exporting into PDF broken?!?

Hi,

I just tried to export a new invoice as PDF but I get a weird save-as dialogue of an html-file (as you can find in the attachment)

Why doesn't it allow me to export to PDF anymore?

I'm using the same browser as always (FF 3.05). I've tried in Chrome too but same problem.

Please help urgently!!!

Cheers
Kai

PS: I've complained about changing line-heights in my invoiceing templates in the past (without ever touching them) and it happened again recently. All the text in my tables got liftet up a few pixel so that the text no longer sits in the middle of the table cell. This happened several times in the past without me doing anything to the template... are you working on the PDF generator???