Commercial Use Suspected, Removed, Crashed, Reinstalled, OK!
Sorry for the complicated title, but I want it to be searchable by anyone else who may have experienced the same problem I just did.
I recently completed the "Declaration of Private Use" form because I didn't want to see the "Commercial Use Suspected" messages every time I connected to one of my other 4 PCs (I have 5 in total).
Today for the first time my XP machine would not connect to any of my Windows 10 machines (except that I didn't try the one in the kitchen - it wasn't running.)
I have screenshots of various messages which I could post, if required. They were:
"Teamviwer has encountered a problem..." - i.e. the usual Microsoft crash notification,
"The instruction "----" at address "----"... the memory could not be read" - another MS message.
The three Windows 10 machines could all connect to each other.
Only on one occasion did I get the "Commercial use suspected" message. All other Win10 to Win10 connections were free of the "Commercial use suspected" message.
I rebooted my XP PC and did not install all the usual programs that normally get installed on startup, but I still got the same "crash" report or "Memory unreadable" reports when running Teamviewer. These problems would occur on the XP machine whether I was trying to connect FROM the XP machine or TO it.
In desperation I thought I'd re-install v 14.1.9025.0. Amazingly - to me, at least - Teamviewer now works OK.
If it hadn't worked, I was going to ask Teamviewer to "undo" whatever you did to remove the "Commercial use suspected" message. I had assumed that maybe there was a path through the software that had never been used when "Commercial Use" was suspected, and by changing my account to remove that message you had changed the path that the software took and it then hit this memory error.
Anyway, after re-installing, all appears to be OK again and instead of the "Commercial use Supected" message I now get the "Buy Now" message which is fine.
I hope this log of events is of use to anyone else that gets into this situation.