I just plugged my hair out on this too. Open up “nggallery.css” in the CSS folder.
Find the style below and comment out or delete ‘width: 100%;”
See my example below:
.ngg-imagebrowser img {
border:1px solid #A9A9A9;
margin-top: 10px;
margin-bottom: 10px;
/*width: 100%;*/
display:block !important;
padding:5px;
}
That did it for me, good luck
