Today's "critical Update" (They all seem to insist they are critical these days)

broke an extremely critical function:  My ability to open more than one instance of Desktop Accountant 2021.

This capability is critical for me as I work with many different clients who themselves may have multiple companies and files.  This is absolutely killing productivity.

The error message is ironic, saying I can't open more than one company file, but then make a futile attempt at being helpful, and informs me that Only QuickBooks Account and Enterprise SOlutions can open 2 files at once...  That happens to be exactly what I'm using.

Killing all QuickBooks and Intuit services and starting up again, which cures most QB ills, does not help this time, nor does running as admin.  I have all of the required/suggested Anti Virus exemptions, but just in case I turned it all off for 30 minutes and still "no joy in Mudville." (look it up).

This brings me to my other observation:  After being a QuickBooks ProAdvisor since that program first existed, and QuickBooks itself since I beta tested it in the 90's, desktop updates have never been as horrific as they have been this year so far.  EVER.

Oh, and before someone blames my computer: 

Win 10 Pro

i7 Intel CPU

64 GB RAM

NVME storage drives

300/300Mbps internet connection.