We have fixed this issue. Keynote conversions are up and running
Do keep us posted, in case you continue to have similar issues. You can file a ticket on our Help section: www.slideshare.net/help
Some of our users have reported that though they are having issues with the conversion of keynote presentations. This is a technical issue from our end, as there are some glitches with our keynote conversion servers. Our team is working diligently to resolve this.
Alternatively, you may try converting your file to a pdf format and then uploading it.