not sure if this will help but i had it happen on my dragon ...


1. i just viewed faces and then it allow me to delete it ... (which I am sure you did that already )

2. if i could not delete it ..I just seen it would join the dragon ..I append poly and make it totally join the dragon and then i went back and deleted the outer half and then the other face .

3 ..if nothing else worked ..I just made a poly sphere and joined it to the face or grouped it to the face all by itself and then seperate it and then deleted it ...

hope that helps ....

just from my experience it worked for me ..hope it works for you