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Nitro PDF Printer 11 and Outlook 2016 behaving badly


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Greetings to the well of knowledge...

I have Nitro Pro 11 installed on my PC.  Nitro PDF Printer has been functioning flawlessly in all applications for three years.

Over the past couple of days, though, when I try to print to the PDF printer from Outlook 2016, Outlook decides it wants to print to my default HP printer instead.  No errors or warnings are thrown.  This ONLY happens in Outlook; all other apps (including all other Office apps) print to PDF as they should.  So it seems as though something happened in Outlook that I cannot identify.

What I've done:

  1. Restarted Outlook.
  2. Restarted the Nitro PDF Printer service.
  3. Restarted the PC.
  4. Rebooted the PC.
  5. Set the Nitro PDF Printer as my default printer.
  6. Did a repair on my Office 2016 installation.

Before I do the nasty and completely uninstall/reinstall Outlook and/or Office (which is going to be royal pain), has anyone else seen this happen?



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  • Official Nitronaut
Allain Umailin

Hello @KeACJR,

Thank you for reaching out to us through our Community Forums!

In order for me to further assist you with your concern, could you please provide the following?:
-Any changes few days ago you are aware of before this happened?
-Nitro Pro build (format is 11.X.X.X, e.g. you are working with. You can find this out by clicking on 'About Nitro Pro' under the Help tab or you can go to Control Panel > Programs and Features.

-Have you tried running a repair of the Nitro Pro application? You may refer to this article: https://kb.gonitro.com/knowledgebase/#/search/repair/000004603

Thank you very much in advance and I am looking forward to hearing back from you. 

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Good morning...

Last Friday, I upgraded to which I learned is the latest V11 update.

Other then normal Windows Updates, I am not aware of any other changes to my environment.

I will attempt to repair Nitro.

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Hello again...

I took a look at my Event Log and found this...



Outlook disabled the following add-in(s):

ProgID: NitroPDFProfessional.MSOfficeAddin11
GUID: {D7570413-6651-467E-AF76-69BDD1265663}
Name: Nitro Pro
Description: Nitro Pro Outlook Addin
Load Behavior: 3
Location: c:\program files (x86)\nitro\pro 11\nitro.officeaddin.net.proxy.11.dll
Threshold Time (Milliseconds): 1000
Time Taken (Milliseconds): 1341
Disable Reason: This add-in caused Outlook to start slowly.
Policy Exception (Allow List): 0


However, I also see that Outlook itself acknowledges that the Nitro add-in caused Outlook to start slowly but wasn't disabled because Nitro is on the "always enable" list.

I'm not sure if the add-in is actually running or not.


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Hello again!

My next test was to try setting the Nitro PDF Printer as my default printer.  When I did this, Windows threw an error indicating that it could do this (and I now wish that I had written down the error number).

So my next step was to remove the Nitro PDF Printer as an installed printer on PC, then reinstall it using the Nitro Help/Support Tools menu.  After doing this, I was again able to print to the PDF printer!!!  Let's see if this actually sticks!

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