Well, Gmaps, they do what they want.. Stefan made some post some time ago that says in what order you have to upload the files/etc. I think it was gmap->serveroptions->levels. It also said (if I remember correctly) if you didn't do that the gservers cache is screwed and you have to restart it.
Again, I don't know if I remember correctly and I also don't know if that works.
I also had problems with gmaps not loading, whatever I do, never got it to work
They are pure evil.