Sage 50 Application Crashes after Security Update 10-Nov 2026

In case anyone else has recently encountered issues with functions in Sage 50 US crashing suddenly, it is related to compatibility issues in the latest Microsoft Security Update released this week. Having already worked over Sage to no avail, I thought to check for recent Windows Updates. Indeed, the affected user's PC had installed the latest security update the night before (KB5132061, KB5132059, KB5121096).

I removed the update and disabled windows updates on all Accounting Department computers as I suspect a 30-day pause won't be enough for a fix to come from Microsoft. After retrieving data from Event Viewer, I went to Sage's support page to send up a notice and discovered they are already aware of the issue.

In the meantime, Sage's official answer is to remove the latest security patch and restart. I can confirm that the application does work normally after removal. 

Note, the application will open normally, but when trying to open database items (Invoices, POs, etc.) it will crash at launch of those functions. 

Below is the Event Viewer record for the crash, it highlights the affected dll in the Sage application that fails to respond after the security update. 

Faulting application name: Peachw.exe, version: 2026.0.0.82, time stamp: 0x68ee9cae

Faulting module name: Pchctls.dll, version: 2026.0.0.82, time stamp: 0x68ee999a

Exception code: 0xc000041d

Fault offset: 0x000512ce

Faulting process id: 0xECC

Faulting application start time: 0x1DD72B6CB4581B8

Faulting application path: Program Files (x86)....Peachw.exe

Faulting module path: Program Files (x86)....Pchctls.dll

Report Id: 13719643-0442-4a6e-ad55-f15c42759163