I'm having almost the same problem, i.e. BIS messages are displayed for about a sec. before going to BES messages (this I can live with....sorta)...what I hate, is the fact that my sent messages are being hidden.
Were you able to sort out your issues? I've tried sending messages to empower and they don't even bother to reply...
I would contact Empower. I know with regular email reader I has several issues. They may have updates to the software. Try going to ota.getempower.com and see if they updated version of the BES software. If not write to them and if they do they may have another link for you