PaulPearsonJSY:
Two places to check:
1. Door Settings > Door Settings > Door Settings & Attributes > Model Attributes >
3D Detail Level, if this is set to "by MVO" then:
2. Model View Options > Detail Level of Doors, Window and Skylight Symbols > 3D and Section/Elevation > set this to "Full".
You should add a Signature to your Profile (click the Profile button near the top of this page) with your ArchiCAD version and operating system (see mine for an example) for more accurate help in this forum.
David