The z-index on the RokBox module is set to z-index: 25000. That's 'higher' than our modal popup. You should either:
* Decrease that to less than 1050 (what our modal uses)
* Switch to using the SCLogin module. The SCLogin login area dissappears after the user has tried to sign in, so you won't have that conflict.
For the white on white, your default body color is set to white, which is making it invisible. If you add the following to your template's CSS, it will fix the issue:
#jfbcLoginModal {
color: black;
}
I hope that helps!
Alex