Experienced the same nightmare and spent hours trying to resolve the problem. Once I determined that it was the McAfee software I deleted the program and everything works fine. I spoke with McAfee software tech support and they explained that they're working on a "patch" to resolve the problem. Any updates on the patch?? They also explained that the issue does not impact the 2018 QB program. The problem with that is we have numerous clients using 2016 and 2017 and we cannot ask them to incur the cost of upgrading because of our firm issues with antivirus software. Any additional updates would be appreciated.
Thanks for your post!