In the WikiExtension, there are numerous inconsistencies between the engine name and the Engine object are returned. This causes it to blow-up when any engine is selected other than retro.
I will be working on this problem on my fork at http://github.com/tekwiz/retrospectiva
I’ve fixed this:
http://github.com/tekwiz/retrospectiva/commit/f6759bab6b6fb4d4170d340167dead413e218a14 http://github.com/tekwiz/retrospectiva/commit/c1378eea63463af52119a27f10a2628fcb3c0649
I am initiating a pull request.