ZetaWorlds runs on newer versions of OpenSim. Often ZetaWorld code is a bit beyond the current Opensim version, known as the "bleeding edge". As such, grids running on older versions or some other code package, may not be fully compatible. If you are having issues HGing somewhere, please try relogging. If that hasn't helped, then try HyperGridding somewhere else first and then to your actual destination. If you still have issues, it is possible that particular region is offline. You may run into any variety of issues in a grid running older code when HyperGridding around, such as, avatar/s not rezzing, BoM not working, objects not rezzing, lag conditions, etc.