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Tomm111-Garnet
11-Garnet
Aug 13, 2026 12:19 PM UTC
Solved

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

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.

    ptc-791056Answer
    5-Regular Member
    Aug 25, 2026 6:33 PM UTC

    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.

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    37 replies

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    ptc-7910565-Regular Member
    5-Regular Member
    Aug 25, 2026 8:08 PM UTC

     

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    ptc-7910565-Regular Member
    5-Regular Member
    Aug 25, 2026 8:10 PM UTC

    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
        }
      }
    }

     

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    HH_143890113-Newcomer
    3-Newcomer
    Aug 28, 2026 9:01 AM UTC

    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

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      GA_146668333-Newcomer
      3-Newcomer
      Aug 31, 2026 8:01 PM UTC

      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

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        Tomm111-GarnetAuthor
        11-Garnet
        Sep 1, 2026 8:14 AM UTC

        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. 

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        BR_128170903-Newcomer
        3-Newcomer
        Sep 9, 2026 1:32 PM UTC

        I have the same issue with any of the versions: Mathcad Prime 10, 11,12.

        What is the solution ?

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        LucMeekes23-Emerald V
        23-Emerald V
        Sep 9, 2026 2:36 PM UTC

        See above, posts from  ptc-791056,  HH_14389011 and  Tomm1.

        Success!
        Luc

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        BR_128170903-Newcomer
        3-Newcomer
        Sep 10, 2026 6:27 AM UTC

        On the Mathcad Prime 10, 11 there is no “MathcadPrime.runtimeconfig.json” file, this is the issue.

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        LucMeekes23-Emerald V
        23-Emerald V
        Sep 9, 2026 5:50 PM UTC

        It appears like one of the windows updates:

        • Security Update (KB5124008) (26200.9445)

        • .NET Framework Security Update (KB5126052)

        • .NET 9.0.20 Security Update for x64 Client (KB5126105)

        • .NET 8.0.31 Security Update for x64 Client (KB5126104)

        has solved the problem. 

        (I set the registry change suggested by HH_14389011:

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

        Type - String Value

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

        Value Data - true

         

        restarted windows, and it updated the items above. After that Printing to .pdf worked. Then I removed the registry change and it was still ok printing .pdf. For Prime 10, 11 and 12 on Windows 11)

         

        Success!
        Luc

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