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### Environment

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If you fetched the source from Git, state the Git commit you used, preferably as the full 40-digit commit hash.  Please do **not** say "HEAD", "current", or similar relative references.  The meaning of relative references can change as contributors publish new code.  The 40-digit commit hash will not change.

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  Good URL: https://www.dxx-rebirth.com/download/dxx/user/afuturepilot/dxx-rebirth_v0.60-weekly-04-14-18-win.zip
  Bad URL: https://www.dxx-rebirth.com/download-dxx-rebirth/
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#### Operating System Environment

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State what platform (Microsoft Windows, Mac OS X, or Linux) you used.  If you used multiple, list all of them.
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For Windows, if readily available, also state the installed Service Pack.
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* Microsoft Windows
  [ ] Microsoft Windows XP
  [ ] Microsoft Windows Vista
  [ ] Microsoft Windows 7
  [ ] Microsoft Windows 8
  [ ] Microsoft Windows 8.1
  [ ] Microsoft Windows 10

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Mac OS X.  Add versions as needed.
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* Mac OS X
  [ ] Mac OS X 10.8
  [ ] Mac OS X 10.9
  [ ] Mac OS X 10.10
  [ ] Mac OS X 10.11
  [ ] Mac OS X 10.12
  [ ] Mac OS X 10.13

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Add versions as needed.
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* Debian
  [ ] Debian Wheezy
  [ ] Debian Jessie
  [ ] Debian Stretch
  [ ] Debian Buster
* Fedora
  [ ] Fedora 26
  [ ] Fedora 27
  [ ] Fedora 28
  [ ] Fedora 29
* Ubuntu
  [ ] Ubuntu 16.04 LTS (Xenial Xerus)
  [ ] Ubuntu 16.10 (Yakkety Yak)
  [ ] Ubuntu 17.04 (Zesty Zapus)
  [ ] Ubuntu 17.10 (Artful Aardvark)
  [ ] Ubuntu 18.04 LTS (Bionic Beaver)

[ ] Arch
[ ] Gentoo

#### Game environment

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If the issue is specific to a particular mission, give the name of the campaign and the level of the mission within that campaign.  If the campaign is not one of the core assets (`Descent: First Strike`, `Descent 2: Counterstrike`, or `Descent 2: Vertigo`), give a download link to the campaign.

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-->

### Description

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Describe the issue here.
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#### Regression status

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Is the reported problem present in prior releases of Rebirth?  Is it a bug from the original game?

What is the oldest Git commit known to present the problem?  What is the newest Git commit known not to present the problem?  Ideally, the newest unaffected is an immediate parent of the oldest affected.  However, if the reporter lacks the ability to test individual versions (or the time to do so), there may be a range of untested commits for which the affected/unaffected status is unknown.  Reports are not rejected due to a wide range of untested commits.  However, smaller commit ranges are often easier to debug, so better information here improves the chance of a quick resolution.
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### Steps to Reproduce

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For build failures, provide:
- The `scons` command executed.
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-->

* Engines affected:
  [ ] D1X-Rebirth
  [ ] D2X-Rebirth

* Game modes affected:
  [ ] Single player
  [ ] Multiplayer competitive
  [ ] Multiplayer cooperative

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If the issue is only observed in single player, delete this next group.
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* Players affected by issue:
  [ ] Game host
  [ ] Game guests