Problem Rated 5 out of 5 stars

Prevents going backwards sometimes. Go here: http://en.wikipedia.org/wiki/Lagan_Canal and click on the picture upper right. Now click on the next picture. Now go backwards. Nothing happens.

Version 1.0a seems to have fixed this problem. Fifth star given.

This review is for a previous version of the add-on (1.0.1-signed).