If you're running v18, try opening jAlbum's "lib" folder and replace the file "jalbum-core.jar" with this beta of jAlbum 18.1:
http://jalbum.net/download/beta/jalbum-core.jar
You locate the "lib" folder by opening jAlbum, then selecting Tools->Open directories->"Program directory". Now you'll find the "lib" folder in Finder. Ensure you really REPLACE the existing jalbum-core.jar file with the one I linked.
Looking forward to how it works using the 18.1 beta!