Based on Witchy's description of his problem and my own experience it appears that the warning has something to do with the configuration of the up axis. Its my understanding that Maya's default is "Y up" (although I have seen reference to the fact that it is actually "Z up"; my default configuration is "Y up"...I'm on a Mac, but that shouldn't make a difference). My own problem seemed to start when I (knowingly) changed to a Z up configuration (following the workflow that is described in the new Inside Maya 5 book). Once I did that I started getting the Warning about not finding a suitable startup camera:front). Once changed, Maya retains the configuration. So, a scene that had been created with a Y up orientation will appear to be incorrectly oriented when opened in the Z up configuration, obviously. There may well be a way to instruct Maya to open a scene with the configuration in which it was created, but I'm not sure. Nevertheless, it seems to me that you should be able to change the default Y up to a Z up without getting the camera warning, perhaps there's something else that is needed to be changed (a camera revolve?), but I was hoping that someone with a good deal more Maya experience than me could point the way.