I am using Sketchup Layout Pro 2018. While trying to dimension models, I have consistently run into an issue with the dimension tool not snapping to common points (e.g., corners of models). Not sure if this is a bug or a flaw, but it is certainly frustrating.
Anyone have a thought about what is going on?
I understand that it is frustrating but since section cuts aren’t snappable edges in SketchUp, there’s nothing for the Dimension tool in either SketchUp or LayOut to grab onto. I don’t believe that’s a bug. It’s just the way sections are. There are a couple of options, though. You can create a group from slice and dimension to the edges in that group or you can use TIG’s Add Section Cut Face to create a face with edges that the Dimension tool can snap to. You can also apply a material or color to the face.
My Trick: In LO, select a No-Section STYLE. /SketchUp Model Tray/Style/ Make your Dimensions and Re-Select the Section-Style.
Nino
Thank you, both!
On a somewhat related note, it would be nice if there was a clear way to correlate section labels in Sketchup with drawing labels in Layout…
Haven’t been able to make that work.
6 years later 
but then you can’t see the actual geometry to be dimensioned…
am i missing something?
Well; if the “view” hides geometry -for example you are dimensioning interior elements and unchecking the Section hides things when the Exterior Walls become visible- you may want to add an “X-Ray” Vision to the process.
Nino