Skip to main content
Tomm111-Garnet
11-Garnet
August 13, 2026
Solved

Save as PDF or Print to PDF causing "Unexpected error" Mathcad Prime 12

  • August 13, 2026
  • 31 replies
  • 2051 views

Hello!
We have 2 users with 2 different computers reporting the same issue with their prime files.
I don’t know if it has something to do with the latest august Windows 11 Cumulative update (KB5121003)?
The issue started happening yesterday after the users updated their Windows 11.

When we try to Save as PDF or use the Print function we get the same errors. And we have tried several PDF printers. It only creates a .PDF file with 0kb in size. 

I uploaded 2 files that we are experiencing this issue with.

    Best answer by ptc-791056

    I would like to inform you that we have identified a workaround for the Print to PDF issue. Please find the workaround below. 

    • Go to >> “C:\Program Files\PTC\Mathcad Prime 12.0.1.0\MathcadPrime.runtimeconfig.json”
    • Open MathcadPrime.runtimeconfig.json file in Notepad/Notepad ++, under the configProperties section, add the following entries:

    "Switch.MS.Internal.TtfDelta.DisableCmapAndSbitOverflowProtection": true,

    "Switch.MS.Internal.TtfDelta.DisableDirectWriteForwarderBoundsCheckProtection": true

    After the change, the configuration should look like this: 

     

     

    Note: Ensure that a comma (,) is added at the end of the previous line (line 16 in the image) to maintain valid JSON syntax.

    31 replies

    Show previous replies
    ptc-7910565-Regular Member
    5-Regular Member
    August 25, 2026

     

    ptc-7910565-Regular Member
    5-Regular Member
    August 25, 2026

    It unfortunately won’t allow me to post the image, but heres the test

     

    {
      "runtimeOptions": {
        "tfm": "net8.0",
        "frameworks": [
          {
            "name": "Microsoft.NETCore.App",
            "version": "8.0.0"
          },
          {
            "name": "Microsoft.WindowsDesktop.App",
            "version": "8.0.0"
          }
        ],
        "configProperties": {
          "System.Reflection.Metadata.MetadataUpdater.IsSupported": false,
          "System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization": true,
          "Switch.MS.Internal.TtfDelta.DisableCmapAndSbitOverflowProtection": true,
          "Switch.MS.Internal.TtfDelta.DisableDirectWriteForwarderBoundsCheckProtection": true
        }
      }
    }

     

    HH_143890113-Newcomer
    3-Newcomer
    August 28, 2026

    MathCAD Prime Version: 11.0.1.0
    .NET Runtime Installed: 8.0.30
    Fonts Used: Calibri

    Resolution:
    Registry Location - HKLM\SOFTWARE\Microsoft\.NETFramework\AppContext

    Type - String Value

    Value Name - Switch.MS.Internal.TtfDelta.DisableCmapAndSbitOverflowProtection

    Value Data - true

     

    Application requires restart to take affect.

     

    If that does not work, add additional key in same registry location:

    Type - String Value

    Value Name - Switch.MS.Internal.TtfDelta.DisableDirectWriteForwarderBoundsCheckProtection

    Value Data - true

      GA_146668333-Newcomer
      3-Newcomer
      August 31, 2026

      Does this work with PRIME 7 and 10 as will. I don’t see a MathcadPrime.runtimeconfig.json file in the C:\Program Files\PTC\Mathcad Prime 10.0.1.0 folder. Just the MathcadPrime.config file

        Tomm111-GarnetAuthor
        11-Garnet
        September 1, 2026

        If you look at the post above yours there is a solution for Prime 11.
        I think it can be used for 10 aswell, not sure about 7. 

        Terms & ConditionsAccessibility statement