input: [ANSWER SUMMARY AND NOTES] In effect the 3d window is showing a custom wall profile with an interior wall running into it (the custom wall profile and interior wall are made of different materials), and are not cleaning up properly, thus the edge of the interior wall can be seen in the exterior wall. This issue can be easily fixed by moving the reference line [START TIME] 0:26:04 [QUESTION] 
output: Custom wall profile issue – Reference line in wrong place so wall not cleaning up properly