Appreciate that, Kershinator

2 server setup is ridiculous, but I do understand why you went that route.

Ultimately we found that if QBFC install is 32-bit it needs to be removed.  Replaced with 64-bit by doing a program repair (22 or 23).

Then ran ToolHub options under Program Problems tab.  Then rebooted.

Successfully hosting 32 & 64-bit DbMgr's now and able to swap to multi-user mode without issues in both.