verify all of the product updates are installed. 

Thanks for your input, but 1ll the other workstations are working and we just did a workstation install just like we did with the other workstations.

What else have you tried?  Have  you deleted the ODBC connections that Sage creates by default?

I have in the past, but I could again.  The issue is that SAMINC and SAMSYS work, but not my live company.

Have you tried to connect the other workstations to SAMINC and SAMSYS? 

We finally we able to do a full product installation on the problem workstation and it is now working. 

We had this error when setting up a test environment. The live data was from Sage 300 2018 PU6 and we restored it into the test environment where the application files were Sage 300 2018 Rev 0. Installed PU6 in test environment and the error went away.

Yes, this error is usually indicative of a Product Update mismatch.

I often comes across this error on one of my sites. I often have to reinstall or rerun WSSETUP on the two terminal servers to have it working again. I always wonder what really breaks the installation because it happens every month. The only thing that I have observed is that the Production Server and the two terminal servers are often requiring Windows Updates. Could the need for Windows Updates be the cause of this intermittent problem?