noizowl,
The first one may be that you are haunted by Align to Pixel Grid. It turns objects with vertical/horizontal segments into zombies that move in jerks.
You may select everything and then untick Align to Pixel Grid in the Transform pallete, and also untick Align New Objects to Pixel Grid in the flyout options.
You may avoid document types with that as default (RGB for web and the like) or change the default for such documents.