Tried creating a new Windows user. Had no affect. Really, the fact that QuickBooks support has no idea what is going on and makes suggestions which will not fix the problem. I am so glad that they switched us all to a subscription model so that we can experience how incompetent their support is.

Here is a suggestion, call your programmers, and let them know that Quickbooks no longer can open Word to do batch letters. Tell them you have a lot of customers who after 4 weeks are considering cancelling their subscription and choosing another accounting package. 

In the meantime, let the rest of customer support know that this issue hasn't been resolved and stop wasting everyone's time with your incompetence.