Every addon has been turned off and the issue still remains. Therefore it is your problem still.
Every addon was disabled. older versions of Shadowed unit frames were installed and the issue remained. And considering its from multiple sources and the third party addon thats broken for her is not broken for myself it can't be that.
So the least you could do is at least look into the issue instead of just brushing it off.
When i'm telling you that with every single addon except shadowed turned on that the config menu can't be accessed then it is no way shape or form a third party add on issue aside from your own. aside from that shadowed unit frames no longer appears in the interface add on list at all in game.
We've completely done a hard reinstall of SUF and still gotten nothing. When you first log in it will give you the option to unlink/link your frames but still no config window.
I only listed the third party addon in case it could help. But seeing as how sexycooldown is not currently broken for myself and SUF is broken for both myself and her; it *is* your problem as SUF is currently malfunctioning with the above error. Had you bothered to read the full post you'd have noticed that instead of stopping at just the part where I listed the third party addon.
Since the last update; my guildmate logged in to find her entire SUF UI reset. Along with her sexycooldown's bar (unrelated to you obviously.)
She checked the folder to find that the profiles for the SUF had been entirely reset for all her characters back to the defaults.
Couldn't access the SUF config menu at all. I logged in shortly after to see if I could access it. got nothing. Instead got this:
Date: 2011-11-24 08:55:18
Error occured in: Global
Message: ...dOns\ShadowedUF_ClassPower\ShadowedUF_ClassPower.lua line 39:
attempt to index field 'bar' (a nil value)
(tail call): ?
We've both already updated to the latest version of SUF as well prior to logging in to having this happened.