[NTG-context] columns and footnotes

Hallo, I use: ConTeXt ver: 2009.11.24 10:13 MKII fmt: 2009.11.24 int: english/english and I have many problems with columns and footnotes. Is there a possibility to set footnotes in two columns too? I tried \setupfootnotes[location=columns] but I can not see any difference to \setupfootnotes[location=lastcolumn] In the moment I use \setupfootnotes[location=page] and it is often the case that footnotes are printed one page to early. It is sometimes the case that the columns and the footnote area overlapp. What can I do to avoid these problems? Wolfgang