Sage Business Cloud and mf.dll?

I have seen this twice now in the last two weeks from the same client.  I know how to fix it but I'm curious as to what is going on.  Could find nothing in the knowledgebase.

Both instances were in a RDP environment.

The program launches and you get a Sage 100:launcher.2016.exe - System error.  The program can't start because mf.dll is missing from your computer.  Try reinstalling the program to fix the problem.  The message will pop out multiple times and after closing it a number of times it just goes away and seems just fine until they log in again.

Oddly enough they are running 2018?

In the browser window there is a tab open that says Sage Business Cloud.  If find that if I close that window, the error will present itself a couple of more times and then after that everything is good for the future.

So it is not that I can't resolve it,  I'm just curious as to what it is all about and how users are getting to this tab. My best guess is that this was a leftover tab from 2016 and someone clicked on something in that window that is trying to fire something up.   Can anyone enlighten me?