Why does text appear blurred in Adobe Presenter 10 output?

I've tested Adobe Presenter and iSpring's free plugin which outputs HTML, and the fidelity of the text in the iSpring is perfect, whereas I'm only getting blurred text from Presenter (and Captivate, for that matter)... Is it something to do with the way the HTML canvas is resizing the content? I noticed iSpring does not output the canvas element.

Can anybody shed any light?