Naming no names because it could happen anywhere (and probably has)...
Earlier this month my host--who is not a bad host overall--did one of their periodic server upgrades. As usual it was preceded by at least five or six emails crowing that they're moving from Linux Something to Linux Something Else, and for more information, follow this link. These server upgrades are frequent enough that I saw no reason to consult the More Information page, because honestly, what do I care what operating system the server uses?
A few days ago I had occasion to look up something in my error logs. Would anyone care to guess what other change they made concurrently with tweaking their operating system, but which wasn't considered important enough to mention in any of their direct emails?
Yes. Yes they did.
I must say, it takes a particular talent to do something that users have been nagging about for several years ... and then do it in such a way that the user is left feeling irritated and disgruntled.