I haven't had a chance to dig into it as I thought I'd quickly try ng_2.6_2.10 version 0.5.0.

With no changes to my code except for changing version of ng in my pom file I now get 404 not found error "NetworkError: 404 Not Found - http://localhost:8081/bc/bc/classpath/net/liftmodules/ng/js/liftproxy-0.5.0.js" Note that the context path /bc is repeated twice.

If I point browser to http://localhost:8081/bc/classpath/net/liftmodules/ng/js/liftproxy-0.5.0.js (i.e. only one /bc then liftproxy js file is found. Not sure if this is related to prior context path issue or not but thought I'd mention it.