Did you by any chance download the 1.0.3 update within a few days of its release? The initial release contained a PPC-specific bug that caused exactly this behavior. We fixed it within 2 or 3 days and figured bumping the version number again in such a short time would only be confusing.
If it's possible that's the problem, please download the current 1.0.3 again and see if that solves it.
If it doesn't, 1.0.2 is still available here
. In this case please drop us a line so we can troubleshoot what's wrong with the latest update.
Hope this helps,