It would be happy to see the new beta9 update. [O:)]
The first 3ds file(bar chair) works fine.

Actually a circle wire and a leg of chair is in hidden mode in his work file but when he exported it, its also exported.So it comes visible in 3ds file.
In the second 3ds file is not looking same as 3dsMax and SH3D
When I import 3ds file it looks like this(below)


When I import the work file its also show me some texture missing.


If I ignore the texture missing then its look like this.

With the work file I understand the SH3D problem.
Briefly: The designer first created the left part of the sofa. Then he made a copy and moved it to right. Then he apply mirror modifier(an effect like smooth in 3dsmax) to it(see below).


This mirror is works in 3ds format when it import 3dsMax. But this mirror is not worked in SH3D.

I found an other case where the points of an horizontal wall were incorrectly computed at the joint with another wall, and fixed it.

I don't get your mind but there is a similar issue with walls. If I draw a wall like this


When I import it into 3dsMax then I want to manualy select all the straight walls(not curved) and apply its smooth value to zero.

In some cases its also not give the good result.Some odd triangle faces are black. To full fill it I need to change its face nomals to be inverted.
I hope you can fix it soon. [:)>-]