I am learning to rig in Maya [2010] (for game design). I created a skeleton, smooth binded it to the model, and now am painting skin weights.

The problem: Every time i paint a skin weight, and then go to another weight and paint on it, when i go back to the 1st weight, it has dramatically changed! its completely different! so basically all progress is removed when go on to the next joint.

heres some screenshots showing what i mean:

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perhaps you binded it with too many influences?

you can go into the component editor window and i think you can lock the wieghts on certain verts.

sometimes it's easier to use the component editor than painting weights sometimes it's the other way around.

but that might resolve your issue

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that's a "Ch" pronounced as a "K"

Computer skills I should have:
Objective C, C#, Java, MEL. Python, C++, XML, JavaScript, XSLT, HTML, SQL, CSS, FXScript, Clips, SOAR, ActionScript, OpenGL, DirectX
Maya, XSI, Photoshop, AfterEffects, Motion, Illustrator, Flash, Swift3D