Instiki with Ruby 1.8.3+
At least on Debian, when I upgraded ruby to 1.8.4 (from 1.8.2) I got the infamous Logger::Format not defined error when starting up instiki. My other rails apps work fine, since I have a recent version of rails installed, but instiki ships with its own rails, which is apparently not new enough. Solution:
cd instiki-0.10.2/vendor
mv rails rails.foo
Voilá, you're now using your own rails install and it works great. This is where we cross our fingers that this doesn't introduce any bugs...