As of the newest update, when I go to view the source code of a post, using the source button, all the text is white, on a white bg making it invisible.  Anyone know what's going on with that?

Are you using a custom theme? Try creating a fresh default theme and see if it's the same using that

Yea I'm definitely using a custom theme...
 

Most likely the issue, try creating a default theme and if it's fine using that contact the theme developer 

Ah, one of our admins developed our custom theme.
Do you know what we would have to change exactly to return it to normal?

Bumping because unresolved.
Does anyone know how to change the text color in the editor in source mode?
It's currently all white, making it impossible to see without highlighting everything.
I'd like to change it back to the standard html colors. 

And yes, changing the theme to the ips default does change the color of the text in source mode from white to black.  So it appears to be a theme issue.
Best case scenario, I'd like to change the text color in source mode from white to syntax highlighting.

Does anyone know what setting I should change in my custom theme to switch the text color in source mode from white to black or syntax highlighted?

.ipsApp textarea {
    color:#fff;
}

Adding this to my custom.css worked, at least as far as the Source editor in a post. I can't vouch for it working across the suite. Hopefully somebody who knows what they're doing can say for sure.

Also, I'd be looking to avoid what appears to be an especially unhelpful theme maker.