Can't edit or create a new style if you created one before

[alopepeo]

I don't know if it's happening only to me, but recently USM doesn't let me create or edit a new style if i have one created before. Anyway, the style applies perfectly but you can't edit it or create a new one.

Follow this steps with a clean Firefox profile or delete all your styles (the USM styles list must be clear):

1. Open the editor window to create a new style.
2. Write your code and save it.
3. Open a new editor window again to create a new style.

Result: The window appears blank, without the editor. If you delete the style created before and you create one again, the editor window shows normally.

Tested under Firefox 17.0b5 and 19.0a1

[megaspel]

I'm having the same problem. Can't edit any of my sheets.