I have a workbook with a few charts and lots of VBA code to do some
fancy stuff.

Everything works as expected when I open the workbook in Excel, but
when I open it in IE I get an error 400.

Most of the error 400's that I've gotten I've worked around, but there
one that I can't think of a work around for.

It occurs when I try to active a chart object within a macro. The
macro is run when a shape in different chart is clicked.

What is this error 400? What does it mean and why would it be occuring
in this situation?

Thanks

James