Okay, since I've seen this thread a couple of days but nothing has come to mind what your cause could be.
A few ideas if you haven't tried them already:
1. If the elaborate eyes are the problem - Can a non EV version be the problem? As it affects races, and if it is a, e.g., German mod it changes race to use German voice files but the game runs in English so there are non to found.
2. Use bash tag "Voice-F" "Voice-M" or remove them from the eyes mod - otherwise I would say try marking Oblivion.esm (don't even know if you can tag a esm, hmm)
3. Download Diverse Voices and bash that
4. Use a program to redirect the bsa files - Like OBMM, re-date and re-direct the bsa files.
5. Make sure you got Oblivion - Voices1.bsa, Oblivion - Voices2.bsa and DLCShiveringIsles - Voices.bsa in your Data folder.
Cheers!