I just found the problem, it was, of course, my fault

.
I misspelled $pref::graal::defaultfontsize when doing
PHP Code:
this.nickZoom = $pref::graal::defaultfontsize / 24;
which was causing it to try to show at 0 zoom (it capped at like .1 or so) and apparently caused some other problems. It's working now.
Oops, thanks anyway, though <3.