I had the same issue. I contacted the developer and he quickly fixed the issue and released v1.3.
I just released a plugin that disables smart quotes (currently only apostrophes and quotation marks) only within code blocks. I’d love to get your feedback on it. It can be downloaded from my site: http://www.planetmike.com
It took me a while to find the quote, for others you may have more downloaders if you link directly to the page of this plugin.
I also get this error. The docs for WP-Postratings also says that the current version is 1.2, and the Dashboard thinks it needs to upgrade to 2.20. If you click on “Download” instead of automatically install, the link takes you to the wp-dbmanager plugin.
