[Inkscape-user] Perspective Effect - Format autodetect failed

Hi,

I'm getting a warning dialog every time I use the Perspective effect. The effect *does* work, but only after I click OK on the dialog box. This is happening on my Ubuntu Edgy box, but not on my XP installation at work.

While I can live with the dialog box popping up, I'd like to create another screencast which includes the perspective effect, but it doesn't look so hot when Inkscape throws a warning dialog up everytime I use it. Any clues as to what it might be? Or how I can avoid it?

Here's the warning message - which usually appears 4 times with slightly different numbers at the front:

** (inkscape:5984): WARNING **: Format autodetect failed. The file is being opened as SVG.