AIX 5.1 dlopen shared library exception handling problem

[Coulter, Scott]

On the AIX 5.1 platform, using gcc 3.3.2, and run-time loading a shared library
via dlopen( ), I find that exceptions which are thrown by the shared library and should
be caught by the executable are not, in fact, caught.  If I link in the shared library at 
build-time, but leave the rest of the code unchanged, the relevant catch block
functions as expected.
 
Also, the identical code base functions correctly on Solaris and HPUX with similar gcc builds.
 
Sorry if this is vague; I'm still working to isolate a test-case from our code that I can send along.
 
/home/coultes >gcc -v
Reading specs from /u03/rpas/scott/aix51.gcc-3.3.2/lib/gcc-lib/powerpc-ibm-aix5.1.0.0/3.3.2/specs
Configured with: ../gcc-3.3.2/configure --prefix=/u03/rpas/scott/aix51.gcc-3.3.2 --enable-shared --enable-threads=posix --disable-nls --enable-languages=c,c++
Thread model: aix
gcc version 3.3.2

Thanks for any help you can suggest,
Scott Coulter
scott.coulter@retek.com