CL650 v1.9 – Assertion "is_valid_poly(poly)" / Black screen on XP12.4.3-r2 (RTX 5090)

[geninmarc]

Hello,

I'm experiencing a reproducible issue with the Hot Start Challenger 650 v1.9.

Environment

• Windows 11
• X-Plane 12.4.3-r2 (Laminar)
• Hot Start Challenger 650 v1.9
• NVIDIA RTX 5090
• NVIDIA GeForce Game Ready Driver 610.62

Symptoms

Career Mode

Career Mode
→ Select Airframe
→ Enter FBO
→ Confirm

 

The X-Camera compatibility notice appears normally.

After clicking Dismiss, the screen remains completely black.

X-Plane does not crash and can still be exited normally.

Non-Persistent Mode

Immediate CTD during loading.

Troubleshooting already performed

I have tested:

• Complete reinstallation of the CL650
• X-Plane installation verified
• Zink disabled
• VR disabled
• Tested with only:
  • PluginAdmin
  • Gizmo64
  • X-Aviation

Same result.

I then restored all my plugins.

Other complex aircraft work perfectly:

• ToLiss A320 ✔
• Zibo 737 ✔

Therefore this does not appear to be a general X-Plane or plugin issue.

No CL650 persistent files remain under Output or AppData.

Log.txt

The log always ends with:

 

CL650[geom.c:1342]: assertion "is_valid_poly(poly)" failed

 

followed by a backtrace inside systems.xpl.

The aircraft appears to complete initialization before the assertion occurs.

Additional information

• Help Desk ticket already opened: #2173
• Ticket status is still New
• Log.txt attached

Has anyone seen this assertion before?

Could this be related to XP12.4.3-r2 or RTX 5090 compatibility?

Any help would be greatly appreciated.

Log6.txt Log7.txt Log5.txt