https://community.graphisoft.com/t5/Modeling/Slab-flattening-problem/m-p/186733#M101156 Is your Section set to Auto-rebuild or Manual Rebuild?<BR /> I think it should automatically update after a change if it is set to Auto-rebuild. Thu, 22 Aug 2013 14:56:37 GMT Laszlo Nagy 2013-08-22T14:56:37Z https://community.graphisoft.com/t5/Modeling/Slab-flattening-problem/m-p/186732#M101155 <DIV class="actalk-migrated-content"><R>I have an annoying problem, I'm not sure whether it's a bug or not. My slab on the 1st floor is flattening every time I change its reference plane location from bottom to top. There are no walls to cover it up, almost the whole slab disappears leaving only the top layer visible. It looks like that in 3d window as well. Any ideas how to solve this? <IMG src="https://community.graphisoft.com/legacyfs/online/emojis/icon_smile.gif" style="display : inline;" /><BR /> <BR /> <BR /> <IMG src="http://i.imgur.com/rTLnJ2N.png" /><BR /> <BR /> <IMG src="http://i.imgur.com/lpXNKE1.png" /></R></DIV> Wed, 24 May 2023 10:45:12 GMT https://community.graphisoft.com/t5/Modeling/Slab-flattening-problem/m-p/186732#M101155 Anonymous 2023-05-24T10:45:12Z https://community.graphisoft.com/t5/Modeling/Slab-flattening-problem/m-p/186733#M101156 Is your Section set to Auto-rebuild or Manual Rebuild?<BR /> I think it should automatically update after a change if it is set to Auto-rebuild. Thu, 22 Aug 2013 14:56:37 GMT https://community.graphisoft.com/t5/Modeling/Slab-flattening-problem/m-p/186733#M101156 Laszlo Nagy 2013-08-22T14:56:37Z