On my Windows Apache instance whenever i try to enable a plugin with the new version 0.6.3 i receive an error saying that there is no method prefixtable().
Fatal error: Call to undefined method Piwik::prefixtable() in xxxxxxxxxx\htdocs\piwik\plugins\GeoIP\GeoIP.php on line 41
That bug report was just for GeoIP. Well the solution listed is valid, this effects more then just geoIP. Any plugin that was made with the tutorial provided online will have this issue.
This function was marked deprecated in 0.2.27 in its phpdoc comments. Its removal was announced three weeks ago on the piwik-hackers mailing list. The wiki and example plugins have been updated.
In future, the continuous integration server should allow us to spot compat busters with non-core plugins. (Part of the work in #818 and the plugin repository).