Tried to start a 1.9b3 SOTP game and got a small 'game can't start' window.
I cleared that window and the next game started fine.
Here's the log.

2021-03-18 14:36:25 Start logging session
2021-03-18 14:36:25 Direct3D
2021-03-18 14:36:25 Screen: 1920 x 1080
2021-03-18 14:36:25 Scale: 1.00
2021-03-18 14:36:25 Background blt: Enabled
2021-03-18 14:36:25 Use Direct X: Enabled
2021-03-18 14:36:25 Use GPU compositing: Enabled
2021-03-18 14:36:25 LogPixelsY: 96
2021-03-18 14:36:25 DeviceType: 0x1
2021-03-18 14:36:25 Caps: 0x00000000
2021-03-18 14:36:25 Caps2: 0x60020000
2021-03-18 14:36:25 Caps3: 0x00000320
2021-03-18 14:36:25 DevCaps: 0x0019aff0
2021-03-18 14:36:25 DevCaps2: 0x00000051
2021-03-18 14:36:25 [DX] Buffer Format: 22
2021-03-18 14:36:25 Graphics quality maximum: 30 ms; 8 cores.
2021-03-18 14:36:25 Transcendence 1.9 Beta 3
2021-03-18 14:36:25 [35] MCI ERROR ProcessPlay MCIWndOpen [TranscendenceIntro.mp3]: Invalid MCI device ID. Use the ID returned when opening the MCI device.
2021-03-18 14:36:28 WARNING: Duplicate entity itGromeCombatArmor = 0x00310179
2021-03-18 14:36:28 WARNING: Duplicate entity stJaxStronghold = 0x00310333
2021-03-18 14:36:28 WARNING: Duplicate entity unidRenegadeLibrary = 0xa0123099
2021-03-18 14:36:28 WARNING: Duplicate entity rsSpeederHUD = 0xa0122120
2021-03-18 14:36:28 WARNING: Duplicate entity stRogueCaptureController = 0xDE110137
2021-03-18 14:36:28 WARNING: Duplicate entity itRogueHideawayLocator = 0xDE110323
2021-03-18 14:36:28 WARNING: Duplicate entity itRogueBaseLocator = 0xDE110324
2021-03-18 14:36:28 WARNING: Duplicate entity efDarkFireHitDefault = 0xDE110609
2021-03-18 14:36:28 WARNING: Duplicate entity dsD789GodTargetStation = 0xD78910EE
2021-03-18 14:36:29 WARNING: Duplicate entity itGromeCombatArmor = 0x00310179
2021-03-18 14:36:29 WARNING: Duplicate entity stJaxStronghold = 0x00310333
2021-03-18 14:36:29 WARNING: Duplicate entity unidRenegadeLibrary = 0xa0123099
2021-03-18 14:36:29 WARNING: Duplicate entity rsSpeederHUD = 0xa0122120
2021-03-18 14:36:29 WARNING: Duplicate entity stRogueCaptureController = 0xDE110137
2021-03-18 14:36:29 WARNING: Duplicate entity itRogueHideawayLocator = 0xDE110323
2021-03-18 14:36:29 WARNING: Duplicate entity itRogueBaseLocator = 0xDE110324
2021-03-18 14:36:29 WARNING: Duplicate entity efDarkFireHitDefault = 0xDE110609
2021-03-18 14:36:29 WARNING: Duplicate entity dsD789GodTargetStation = 0xD78910EE
2021-03-18 14:36:29 Loading news.
2021-03-18 14:36:31 All resources downloaded.
2021-03-18 14:36:37 Initializing adventure: Transcendence.tdb
2021-03-18 14:36:37 WARNING: Duplicate entity dsD789GodTargetStation = 0xD78910EE
2021-03-18 14:36:40 Created new game
2021-03-18 14:36:40 Starting new game.
2021-03-18 14:36:46 Unable to create system: Crash in CreateSystemObject.
2021-03-18 14:36:46 Create system stack:
1: SystemType nodeID=SE unid=100001
2: RandomLocation criteria=*voermsRegion
3: RandomStation stationCriteria=*enemy; *property:challengeRating[6-7]; locationAttribs=voermsRegion, asteroids, asteroidBelt, ice
2021-03-18 14:36:46 Cannot create system SE: Crash in CreateSystemObject.
2021-03-18 14:36:57 Initializing adventure: Transcendence.tdb
2021-03-18 14:36:58 Created new game
2021-03-18 14:36:58 Starting new game.
2021-03-18 14:37:06 Loading image ResourcesScreenSnow.jpg for 61448.
2021-03-18 14:37:06 Started game version: 1.9 Beta 3 (1.9.203.0)
2021-03-18 14:37:06 Extension: Taipan GodShip [7.00]
2021-03-18 14:37:06 Extension: Commander's Log [2.02]
2021-03-18 14:37:06 Using API version: 44
2021-03-18 14:37:30 End logging session
2021-03-18

relanat 2 Apr 2021:

Had this happen a few times now so it wasn't a one-off error.

george moromisato 2 Apr 2021:

Thanks! I've had this happen a couple of times during the Twitch stream, but I haven't been able to reproduce it.

This tells me that it's a bug in 1.9 Beta 3 instead of Beta 4, which helps to narrow it down.

george moromisato 22 Apr 2021:

Fixed in 1.9 Beta 4. The problem turned out to be a bug in re-initializing when switching to different extension combinations. Under certain cases, when extensions override types (or inherit from types), we failed to clean up. This is now fixed in 1.9 beta 4.

Thanks!