Client Technology Profile
Client Overview
Fairfax Accounting LLC is an accounting firm that relies on ATX Tax as a business-critical application for preparing and managing client tax returns. Having used ATX Tax for more than five years, the firm depends on a stable and reliable hosting environment, particularly when working with client tax documents and preparing returns.
When an unexpected application crash began preventing the client from printing tax returns, the issue required more than a standard application or printer troubleshooting approach.
The Challenge
On September 24, 2026, Nessibeli Jaxbayeva reported an issue with the ATX Tax application unexpectedly crashing whenever the firm attempted to print a client tax return. The Sagenext support team initially performed several standard troubleshooting steps, including:
- Repairing the ATX Tax application
- Reinstalling ATX Tax
- Troubleshooting the printer configuration
- Testing different printing-related settings
Despite these efforts, the application continued to crash when the client attempted to print.
Because the problem remained after reinstalling the application and troubleshooting the printer, the team needed to investigate the underlying Windows Server environment.
Finding the Root Cause
Further investigation pointed to a recent Windows Server 2022 update as the likely cause of the problem.
The team identified that the August 11, 2026 – KB5121650 Cumulative Update for .NET Framework 3.5, 4.8, and 4.8.1 for Windows Server 2022 could cause certain Windows Presentation Foundation (WPF) applications to encounter a System.IO.FileFormatException when printing or generating PDF/XPS content using certain fonts, including Calibri.
The behavior matched the symptoms experienced by Fairfax Accounting LLC: ATX Tax was functioning normally until the client attempted to print a tax return, at which point the application crashed.
This helped the Sagenext team determine that the problem was likely related to the Windows/.NET Framework update rather than the ATX Tax installation or the printer itself.
The Solution
After identifying KB5121650 as the likely root cause, Sagenext engineer Bruce Anderson removed the update from the Windows Server 2022 environment.
Once the update was removed, the ATX Tax application was tested again using the same client tax return.
The return printed successfully without the ATX Tax application crashing.
This confirmed that the issue was associated with the Windows Server .NET Framework update and not with the ATX Tax installation or printer configuration.
The Result
By investigating the issue beyond the application and printer configuration, the Sagenext team was able to identify the underlying Windows Server update responsible for the printing failure.
The resolution restored the client's ability to print tax returns through ATX Tax and allowed Fairfax Accounting LLC to continue using its business-critical tax software without the recurring application crash.
Key Outcome
ATX Tax printing was successfully restored after identifying and removing the problematic Windows Server update.
Why Expert Hosting Support Matters
For accounting and tax professionals, a problem with a business-critical application can quickly disrupt daily operations. In this case, reinstalling ATX Tax or changing printer settings would not have addressed the actual cause because the issue originated at the Windows Server/.NET Framework level.
Sagenext's technical support team investigated the issue systematically, moving from application-level troubleshooting to the underlying server environment. This approach helped identify the update responsible for the printing failure and restore normal ATX Tax functionality.
Conclusion
Fairfax Accounting LLC's ATX Tax printing issue demonstrates how seemingly application-specific problems can sometimes originate from an underlying server update.
Through detailed troubleshooting and server-level investigation, Sagenext identified the connection between the ATX Tax printing crash and the KB5121650 .NET Framework update. Removing the problematic update restored successful printing and helped the client get back to normal tax-processing operations.
At Sagenext, our technical support team goes beyond basic troubleshooting to identify and resolve the underlying causes of issues affecting your hosted ATX tax and accounting applications.
Need Reliable ATX Tax Hosting Support?
Join accounting firms like Fairfax Accounting LLC who trust Sagenext's hosted environment and support team to keep their ATX Tax workflows running — even when the issue starts at the server level.
