Dan is correst, it most likely dried too fast. You'd need to place it where there was minimum air-flow. I haven't had a mold problem on live oak in Fla., so you probably won't ,either. I've air dried then kiln dried live oak , mixed it with other oak, and made flooring, no problems. It's the sawing of it I HATE!! Kinda like Dan and hickory!

Also, live oak logs can be twisted, and have other problems. If you saw this kind of log use it for timbers , blocking, etc. and forget trying to make any boards of value, success will be minimal.
Mark