Line Numbers Impossible To See in AdminCP Editor

[Serpius]

FASTyle replaces default's codemirror with an enhanced version; usually uninstalling the plugin works just fine, but in your particular case, you are using a custom ACP theme which kinda interferes with FASTyle's codemirror version I suppose.

The solution is simple as restoring the original file, or blame your theme and work it out by overriding CSS rules.

This does not make any sense "blame your theme and work it out by overriding CSS rules" because the same issue showed up in the DEFAULT copy of the AdminCP of MyBB installation. That's exactly what I said in my original post.

Go ahead blame the developers of the MyBB theme for that one, but keep me out of it.