Found index collision bug today as I moved my Kukkaisvoima entries around. The index consists of unique timestamps of blog entries so that it can be sorted. First part is the filename timestamp and second part is timestamp of the file. As I copied entries from one directory to another I managed to lose the file timestamp, so I got couple of collisions and Kukkaisvoima failed to display some of the entries. Luckily that was easy to fix. The fix is in version 5.
Version 5 introduces also sidebar with categories and monthly archives. Couple of new div elements has been added so that sidebar could be easily positioned. I first thought that sidebar should be optional, but since its quite easy to hide it with css, it's visible in default installation. Sidebar needs also new language variable: l_archives = 'Archives'
When upgrading Kukkaisvoima you can remove main.index-file from your index directory (default is temp) so that Kukkaisvoima can generate new index. It is needed sometimes, for example when upgrading from version 4 to 5.