LaTeX.org

Hi,

My TexShop in Mac OS Leopard (10.5.8) generate errors only in the floats of table and figures.
The LaTex errors say;
Either
Extra }, or forgotten \endgroup.
or
LaTeX Error: \begin{minipage} on input line 1151 ended by \end{spacing}.

These errors didn't occur until I update my lyx from 1.6.7 to ...

Thanks for your help.
I did that, but it doesn't work, either.
I post my preambles here, can you or anyone find any problems? I don't know what package can be deleted, which I guess might solve the problem....hopefully, I could get some feedback either from you or somebody.
Thanks!
\documentclass ...

I used bibdesk for my references.
When I export lyx file to latex, all my references are gone and citations turn to ? or ??.
Here is some related code lyx created when exporting;
...
\usepackage[authoryear]{natbib}
\usepackage[dot]{bibtopic}
...
...
\begin{singlespace}
\bibliographystyle{apsr ...