This might be an overkill but if you are after the 'when' the setting was applied you can use this log reader connector to check for the specific string and alarm on it.
So while you might not see it in the cube interface it could still be present in the log file itself before it rolls over. No guarantees, of course.  In addition you could "play" around with size of your log files to accommodate more.

Hi Dave,

I believe this change is only reflected in the log file of the element itself. There is no corresponding information event, for example.

However, if you go to Cube > System Center > Logging > Elements, you'll see the configured log level displayed next to each element's name. That makes it easy to quickly identify which elements are set to a higher log level.