Hi All! 
I’ve recently been modelling a fairly basic car, with less than 10 posts I am currently unable to post a picture, but it should be easy enough to understand (I hope).
Basically, I had nearly finished the car, I then decided to model the wheel on a separate layer. Once I had finished this, I moved it back to my main layer only to find that several bits and pieces had faces missing. I have tried deleting the wheel and this made no difference. Is there anything I can do besides the pain staking task of re-doing each and every face that is missing? Sometimes, they are missing to the naked eye, yet I try to re-create them and I get told that they are already forming a face?
Many thanks in advance,
Emrys
Thank you very much, however, there is just one more thing, I would like to know why this would happen? So as to prevent it in the future. I probably should have added that all was well and every face was showing correctly prior to me creating said wheel.