[yatac42]

I can't find any evidence of that being true. In this article[1] for example, all the examples either have the comma before the "aber" or none at all. I can't find any example anywhere where a comma after the "aber" would be correct nor can I think of one myself.

I also wouldn't say that German has "otherwise the same grammar as English". (Or in wrong German: "Ich auch würde nicht sagen dass Deutsch hat ansonsten das gleich Grammatik wie Englisch" - even if we're just talking about comma rules, the German version should have a comma before the "that/dass").

[1]: http://www.neue-rechtschreibung.net/2012/04/30/kommasetzung-...