HTML Preview download hangs on 50 % on Mac OSX

Hi!

The download of the Mac OSX plattform specific part of the HTML Preview hangs at 50 %. Below the progress bar "XUL" is shown as the currently downloading part.
I had to kill IDEA and delete the "HTMLPreview 1.0" folder in my caches folder to make IDEA run again. Starting the download a day later didn't change anything - again 50 %.

Downloading the HTML Preview on Windows didn't show similar problems and was done in no more than 5 minutes.

Cheers,
Robert