If you have that funny feeling that your surface has crawled away, it is easy to figure out if it has been moved, and easy to fix it as well.
 Go into your surface definition and check out the “edits”. If you see a “Transform…Moved” you know it was moved (either accidentally or on purpose). Right click that edit entry, and you can delete the event which will move your surface back to its original location.
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In the future, locking the surface layer will stop accidental slips.
