I have deleted my dataPoint geometry and now I want to make further changes to the dataPoint. Is this possible?
Yes! Just double-click the dataPoint in the dataPoint list.
You have Freeze Input turned on. Turn it off to see what you have done with your base mesh. The description in the link also has some hints on how to undo unwanted changes to the base.
This is the same Freeze Input issue as above and it has the same solution.
Note that you should show the edit geometry of your inbetween dataPoint(s) before changing the layer in order to preserve its current shape.
Why doesn’t my object look like the dataPoint I’ve modeled? I mean, I’m sure only one dataPoint is active and it’s reached to 100%. Shouldn’t the deformation result in exactly this and only this dataPoint?
Actually, there are a number of reasons your object might look differently:
I have combination dataPoints, some of which have edit geometry. When I change some of the plain dataPoints, the combinations seem to get corrupted.
What happens here is a bit complicated to explain, but in fact it is just what should happen. You are probably showing the absolute edit geometry of the combinations. This means that they behave as if they were absolute, no matter in what mode they actually are. So, any changes to the plain dataPoints (those that influence the pure mix of your combinations) are corrected by the combinations. If some of the combinations have geometry and others don’t, you can really mess up their correction when you change dataPoints that influence them all. The easiest way to avoid this is to ensure all combinations are relative and don’t have any edit geometry before making changes to the plain dataPoints.
This happens when you use a Wacom tablet with the Wacom mouse instead of a pen. If Maya finds a tablet, it enables Stylus Pressure by default. To solve this, simply disable Stylus Pressure in the Tool Settings window.
On a side note, the same problem occurs when painting cluster weights, Blend Shapes, etc.. This seems to be a Maya bug, at least in 7.0.1.