Images losing faces or not moving when doing things.

I have a few questions to clarify your problem. This isn't to be pedantic, but to make sure what you're saying is the same as what I'm thinking. When you say "image," are you referring to a raster photograph or PNG in the Illustrator file, or do you just mean the vector graphics that you are working on inside Illustrator? Also, when you say part of it "disappears" is it gone for good, as in you can't see the paths or shapes in the layers panel any longer or is it still there in the layers but not showing properly? (I have a bug on my machine that sometimes things "disappear" but they're actually just not being rendered. When I zoom in or out it will refresh the preview and actually show me the correct preview.)

If this is a bug, in fact, then I'm misunderstanding. It sounds like, though, that you may be trying to select something and it only selects a portion of what you are intending to select. Illustrator is set up, by default, to select only what you click on. If you click on a shape, it will select that shape, even if it looks like it belongs in a larger group. If you have grouped your graphics, it will select the entire group instead. If you have multiple objects in a layer, it will still only select the individual objects in that layer unless you group them together. One thing about Illustrator that bugs me sometimes is I'll select multiple layers and when I click to move them, it only moves what I clicked on instead of what I had selected. I haven't researched how to change this behaviour and have learned to live with it since it's the default behaviour.

If you're familiar with how Illustrator works (in regards to selecting and moving objects) and it's something beyond what I was describing, please provide a little more info about what you're doing when paths and outlines move but not the filled objects or if you know what may trigger things disappearing.

Hope that helps.

This is in Illustrator btw I forgot to add that