This is probably too late to help you, but 'escape' should cancel the Transform mode.

It sounds like you may have hit Shift + T or clicked the transform tool, and gone into transform mode. You should have seen a menu for transforming pop up, but if that got cancelled/didn't show up, escape will also let you return to normal without applying any changes.

If that isn't what happened and it is still up or it comes back, send us a screenshot at [email protected].