Objects are referenced by a Scene file, so when you save your Scene, you are saving just that - the Scene.  To save your Objects (and their surfacing) you need to choose:

'File > Save > Save All Objects' or 'File > Save > Save All' (Alt s)

Once you click the E button (Envelope) next to a parameter to drive it using the Graph Editor, the E button will become highlighted.

To remove the envelope, hold down the Shift key and left click the E button again.

When an object no longer has any polygons assigned to a specific surface, on reloading of the model (or scene) those unused surfaces will be flushed automatically.

It can be useful for surfaces to linger while assigning them in Modeler, if you assigned a different surface to the whole model, and the previous surfaces were removed immediately, you would lose them.  Having them persistent within a session allows you to further assign them.

Windows™

Hardware

Intel® Core™ 2 or AMD Athlon™ II Processor (or better)
64-bit System RAM: 4GB minimum
Available USB Port (for users with existing hardware dongles)

Operating System

64-bit: Windows Windows 7 64-bit Edition or higher

Mac OS®

Hardware

Intel® Processor
64-bit System RAM: 4GB minimum
Available USB Port (for users with existing hardware dongles)

Operating System

Sierra 10.12 or better

Mojave only supports 2018.x or higher.

Display

Minimum Graphics Card: NVIDIA® GeForce® 8400 series or ATI® X1600
Minimum Screen Resolution: 1024 x 768 pixels

Installation Requirements

Storage:
All systems require 750MB available hard drive space (excluding content)
Complete Content library is approximately 3GB.
Optical Drive:
DVD-ROM for Program and Content installation (for boxed versions of LightWave).

LightWave versions 11.0.3 and higher do not need a dongle. These versions can run on a software-based license. LightWave 11.0.3+ can still use a hardware dongle, but it does not require a dongle.

If the user already has a dongle when upgrading to LightWave 11.0.3+, that user may choose to run LightWave from the dongle or from the software license. If the user has purchased LightWave 11 or higher for the first time, that user will be running a software-based license.

LightWave versions 11.0.2 and older require a hardware dongle and Sentinel drivers. When buying another user's copy of LightWave, do not purchase a copy of LightWave 10 or older without acquiring the dongle that goes with that copy of LightWave.

For LightWave 11, make sure that the Microsoft Visual C++ 2008 SP1 Redistributable Package is installed on each render machine running LWSN.exe. Normally, this package gets installed along with LightWave when using the LightWave installer. However, not everyone uses the installer when setting up LWSN.exe on a render node.

For a LightWave 11 render machine running a 32-bit version of Windows, install the Microsoft Visual C++ 2008 SP1 Redistributable Package (x86). For a LightWave 11 render machine running a 64-bit version of Windows, install the Microsoft Visual C++ 2008 SP1 Redistributable Package (x64).