Make sure your are referencing a View (yellow icon) not a Viewpoint (orange icon), the Views have their own Layer Combination, the Viewpoints use the current Layer Combination. Also check that Dimensions are a Visible Element (click on Arrow on middle right of Trace & Reference palette).
David
David Maudlin / Architect www.davidmaudlin.com Digital Architecture AC27 USA • iMac 27" 4.0GHz Quad-core i7 OSX11 | 24 gb ram • MacBook Pro M3 Pro | 36 gb ram OSX14