Visual Studio 2010 Pro, Class diagram elements keep moving

I have a class diagram in my project. The elements keep movi开发者_如何学运维ng around between saves. This is purely an aesthetic problem. Is this by design, or is there a setting somewhere to say leave the lines where I put them?

In case that isn't clear, you can move the connecting lines around, and interface lollipops. The layout engine doesn't mind putting interface lollipop's text over the top of inheritance lines. I do. So I move the lollipops, or the inheritance lines, but when I reopen the diagram it has moved them again.

I've logged it with Microsoft as a possible bug:

Visual Studio diagram editor bug

Fingers crossed :)