Colin Bigam wrote:

Two somewhat disturbing things. First of all, there wasn't much root growth.

I can't help for that ...

Barely enough, in fact, to compensate for the old, dead roots. Secondly,
much of the new root growth was transluscent yellow, rather than the pale
green I'm used to.

but for this "problem", I can tell you that orchid roots become green
when exposed to light through their plastic container for instance ...
So, if your container if not transparent, there is no worry.

F.