Just received this mail from ST:
Dear Valued Customer,
We are writing to inform you of a change we are making to the SmartThings platform that impacts one or more of your SmartApps or Device Type Handlers. Beginning very shortly (most likely by or shortly after the time you read this), we are going to be restricting the “setDefault”, method on the TimeZone class. We have identified you as
having a SmartApp or Device Type that use this method, and wanted to reach out to you directly to let you know that this will now throw a “Security Exception”.
An example of this would be using the following: “TimeZone.setDefault()”.
Anyone have any information on this issue? Pointer to docs/discussion? Thanks,