We are testing a new build of the Mirador viewer. If it does not load for you at once, you may have to reload the page. The current build integrates a number of plugins to Mirador, three of which have been developed by the Bavarian State Library. A few comments about the image cropper and its usage may be in order here:

(a) You can activate it by clicking the icon that looks like from the menu on the right.
(b) It is designed to work with single view only, not book view (facing pages).
(c) It is recommended that you activate the cropper first, resize the selectable region a bit and zoom in afterwards. You may experience some issues if you zoom in directly and activate the cropper at a deeper zoom level.

Need more information about using Mirador? Pádraic Moran (NUIG Galway) has created a very useful walkthrough video on YouTube, which he created for MIRA, and of course, Mirador has a website.