Whether that makes it broken is up to you; with the Shadowmeld racial competing with, say High Elf Rogues having +2% Agility and the ability to regen 50 energy over 5 seconds with a 1.5 second cast.
So, I made a good choice by picking High Elf? I started to regret not going Human when my class ...
For anyone that runs into the same problem, rather than rolling back Vanilla Fixes, I got this working on my machine by installing ClassicApi. I can't say which method is better, but I figured I'll leave a second option here.