Removing a citation style (& Preferences broken in Z 2.1?)

How do you remove a citation style? searched the site but couldn't find anything. Is there any smarter way than deleting the .csl from App Data\…\zotero\styles?

Tried checking Preferences, but they are apparently broken in 2.1b2. Is this the case for everyone?

(Message:)
Erreur d'analyse XML : entité non définie
Emplacement : chrome://zotero/content/preferences/preferences.xul
Numéro de ligne 566, Colonne 2 : <prefpane id="zotero-prefpane-cite"

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