Our configuration uses this plugin on archived artifacts. In the configuration, we don't define an image width.

In latest build, the images are displayed correctly (full size).
In previous builds, the images are not visible; inspecting the page source code shows that image width is set to "0".

<h2>Screenshots</h2>
<a href="artifact/reports/iPad/Test_AddFavoriteContact/20151030_161534.368//Screen_Error.jpeg" title="reports/iPad/Test_AddFavoriteContact/20151030_161534.368//Screen_Error.jpeg" class="gallery"><img src="artifact/reports/iPad/Test_AddFavoriteContact/20151030_161534.368//Screen_Error.jpeg" width="0" title="Image 0" /></a>

Changing the size in the source code (using Chrome inspector, for example) brings back the images.