C++ exception handler error

[hembree]

I am using VS C++ .NET 2003 and am getting the following warning:

Microsoft Visual Studio .NET 2003\Vc7\includ e\xstring(1453) : warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHs

However, /EHs is specified and I still get the warning. I assume that I should just ignore the warring.