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Allegro Viewer will not start after upgrade

Chris DeWitt

I just upgraded from allegro_free_viewer_16-5 to allegro_free_viewer_16-6.  Right after the upgrade it worked fine but today I keep getting the message

This application has failed to start because callbackMgr.dll was not found.  Re-installing the application may fix this problem.

I uninstalled and reinstalled the viewer but same results. 

I did a regsvr32 "C:\Program Files\Cadence Design Systems\Allegro Free Physical Viewers 16.6\tools\pcb\bin\callbackMgr.dll" to register the dll but I get "Dll_Name was loaded, but the DllRegisterServer or DllUnregisterServer entry point was not found."

  • Chris DeWitt

    Does anyone understand what the problem is?

  • steve

    Check the path settings and also if you RMB on the icon where is the Target pointing to: 16.6 or 16.5. If it's the latter then edit it to say 16.6 and see if that helps.

  • Chris DeWitt
    The path is correct and points to the right version (16.6).  At one point I tried to re-register the dll and received the following.“C: \Program Files\Cadence Design Systems\Allegro Free Physical Viewers 16.6\tools\pcb\bin\callbackMgr.dll was loaded, but the
    DllRegisterServer entry point was not found.This file cannot be registered."

    I rebooted and it worked for a while but then started doing the same thing again.  Haven't been able to get it to run again.
  • Centennial

     I too am having very similar problems after installing allegro_free_viewer_16-6.  After installing the application I got the message "This application has failed to start because callbackMgr.dll was not found.  Re-installing the application may fix this problem." 

     I reinstalled the application and got the same message.  I rebooted my computer and got the same message.

     What should I try next?  Thanks

  • Chris DeWitt

    I don't know what its problem is but I yesterday I did an un-install/re-install with a fresh download of the viewer and it worked.  It still seems to be working today.

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