I believe that the current trunk .jar files should work with version 1.3, though you may need to rebuild your browse indexes (and if you get any errors doing that, it may mean you need to add some missing files to the lib folder – I can’t remember if we changed to using ICU-based sorting between 1.3 and 1.4 or at some other time).
I believe that the problems you are seeing have to do with the searches generated by the AlphaBrowse code not having double quotes around them. Looks like NLA is doing phrase searches but the current trunk code is not. I’ll try to put in a fix for this in the next couple of days. It’s probably just a matter of adjusting the template file for browse results.