It has nothing to do with ubb_jslib, if you access your:
http://orbisvitae.com/ubbthreads/ubb_js/ubb_jslib.jsAND the one from my test forums
https://www.virtualnightclub.net/forum/ubb_js/ubb_jslib.jsAnd compare, you'll see they're the same file (both are the 7.7.0 lib), there is an update for this file in 7.7.1 as the display on some elements were adjusted.