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This literally created nightmares for me (no kidding), because it can screw up the task durations when they are being shifted across weekends. (Bug report sent).
I would strongly recommend to use View->Gantt Chart -> Show Off hours.
One can get rid of all the confusing grid structure for the non-work hours for each day by going to the
Inspector: Project Colors
click the Off-hours block
and reduce the opacity to 0%.
This has the effect of the confusing grid structure to be invisible, BUT the weekends stay displayed!

Hope that helps!