weird footnote symbol

[Junchao Zhang]

Hi,
  I use Lyx 1.6.9 to write my document. It has two footnotes. When I export
it to pdf,  both footnotes look like " 9* The work is supported ... ".
  I don't know where is the 9 from. I only want a simple *.
  Previouly, I didn't have this problem  It happens after I installed some
packages, added the following in the preamble.

\usepackage{url}
\setlength\tabcolsep{1.2pt}
\usepackage{slashbox}


  How can I get rid of the annoying '9'?

  Thanks
Junchao Zhang