Hi Juan,
I have found a work around for this problem while we wait for an update.
The width of the items is controlled by an empty div inserted above the main images, directly above the <!– FILLER DIV FOR WIDTH REFERENCE –> comment in the HTML. If you create @media queries resizing this div in your CSS (for example: @media screen and (min-width: 767px) and (max-width: 991px) { .wmle_container .wmle_item_holder { width: 50%;}} to create two columns on a tablet) then you can make your masonry layout responsive for all devices.
Hope this helps someone!