In addition to what Carlos mentioned about starting NVDA with add-ons disabled to determine whether an add-on could be triggering your problem, it also never hurts to run the COM Registration Fixing Tool (NVDA+N,T,R,Enter).
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Brian - Windows 10 Pro, 64-Bit, Version 2004, Build 19041  

If you think that you can think about a thing, inextricably attached to something else, without thinking of the thing it is attached to, then you have a legal mind.

        ~ Thomas Reed Powell