I downloaded the latest release (1.0.3) but every time I go to upload a page, the program crashes. Also, occasionally (when publishing was working), I would get a blank window, and nothing would happen. When I cancelled and tried it again, it would work.
Thanks @siamon, I have the crash reports and will get a fix into the next release!
Cheers 
@siamon, You can download v1.0 and just publish your site with that version until the next build (due out early next week).
@siamon, Scrap that, seems @tpbradley has worked his magic and we have a new build with a fix in already!
Let us know how you get on.
It only crashes when I publish a single page. When I republish everything, it works. Although, it takes two tries for the action to take place.
Is that still the case with the new build, v1.0.4?
Yes. With the new build.