MultiplicityConfig.exe 4.0.7.2 crashes immediately at startup - c0000409

Windows 11 / ThinkPad T16 Gen 2 AMD - trial works normally on Windows 10 PC

from Stardock Forums

I'm evaluating Multiplicity 4 Pro using the free trial on two PCs. The same Multiplicity 4.0.7.2 trial installer was used on both machines.

On my Lenovo ThinkPad T16 Gen 2 AMD running Windows 11 Enterprise, Multiplicity installs successfully, but the Multiplicity Configuration Utility crashes immediately every time it is launched. The configuration window never appears.

Affected system

  • Lenovo ThinkPad T16 Gen 2 AMD (21K8)
  • AMD Ryzen 7 PRO 7840U with Radeon 780M Graphics
  • 32 GB RAM
  • Windows 11 Enterprise
  • OS build 26200
  • MultiplicityConfig.exe version 4.0.7.2

Behavior / troubleshooting

  • Multiplicity installs successfully.
  • Multiplicity Service is present, running, and configured for Automatic startup.
  • When Multiplicity is launched, MultiplicityConfig.exe appears briefly in Task Manager and then terminates approximately one second later.
  • Running it as Administrator produces the same result.
  • Rebooting does not resolve the issue.
  • The configuration UI never appears in Alt+Tab or on any attached display.
  • Windows Reliability Monitor records a new Multiplicity Configuration Utility failure each time I attempt to launch it.

Reliability Monitor crash details

  • Problem Event Name: BEX
  • Application Name: MultiplicityConfig.exe
  • Application Version: 4.0.7.2
  • Fault Module Name: MultiplicityConfig.exe
  • Fault Module Version: 4.0.7.2
  • Exception Code: c0000409
  • Exception Offset: 001d6e61

Comparison system

I installed the identical Multiplicity 4.0.7.2 trial installer on an MSI laptop running Windows 10 on the same network. On that machine, Multiplicity installs successfully, the Configuration Utility opens normally, and the application appears to operate as expected.

My intended configuration is to use the Windows 11 ThinkPad as the Primary PC and the Windows 10 MSI as the Secondary PC using Seamless mode.

I noticed that the Multiplicity 4.2 beta changelog for version 4.2.0.1 (8/31/2026) includes "Addresses potential crash issue," and that MultiplicityConfig.exe 4.2.0.2 was released 10/02/2026.

The current free-trial download provides MultiplicityConfig.exe 4.0.7.2.

Could this startup crash be addressed by the newer 4.2 build? If so, is there a way for a trial user to obtain 4.2.0.2 for testing before purchasing Multiplicity 4 Pro?

I can provide additional crash logs or diagnostic information if needed.

 

Stardock Software Multiplicity Type: Bug Report
234 views 4 replies
Reply #1 from Stardock Forums Top

Hello,
Sorry to hear you are having issues. I have forwarded your problem/question to Stardock Support Team for their assistance. Please keep an eye on this thread for any updates. We appreciate your feedback and patience. Thank you.

Basj,
Stardock Community Assistant.

Reply #2 from Stardock Forums Top

Hey, appreciate the reply basj. I used Multiplicity for a few years, though it's been 5 years back. With my newer setup, I want to purchase it again, but just want to verify it'll work! You know.

I'll watch for replies here...thanks again basj😁

Object Desktop - Get all of our enhancement utilities in one suite
Reply #3 from Stardock Forums Top

The 4.2.0.1 beta notes say “Addresses potential crash issue,” but they do not identify this specific MultiplicityConfig.exe crash. The 4.2.0.2 notes list the automatic-unlock change; they do not call out another crash fix.

The beta feedback thread lists downloads through Object Desktop Insider builds, the product registration download page for individual purchasers, and Steam’s beta branch. It does not list a trial-only download path: https://forums.stardock.com/540065/multiplicity-4-2-beta-feedback

So 4.2.0.2 may be worth testing, but the public notes do not confirm it fixes your BEX crash, and I can’t confirm that the beta is available to your trial. I would not buy on the assumption that it resolves this.

Reply #4 from Stardock Forums Top

Exactly. That's what I'm trying to find out. Or if there's an alt version I can evaluate in lieu of.

I want to purchase but gotta know. 

Thanks Haalee...hopefully more info soon...I'll continue to watch here.