RTC on G80TH doesn't appear to work after updating to firmware 4.3.8.1

I’ve tried on 3 different modules, and they all seem to fail in being able to set the real time clock - problem wasn’t there with previous version of firmware.

Here’s how I am testing it:
DateTime clockTime = DateTime.Now;
RealTimeClock.SetDateTime(clockTime);
Utility.SetLocalTime(RealTimeClock.GetDateTime()); // Set NETMF time from RTC

If I check the value in RealTimeClock.GetDateTime() it’s still uninitalized (1/1/1980).

I tried calling the code in a loop as was posted in the forum for a similar issue to no avail.