On some systems Timer, Periodic and Sunrise/Sunset triggers may not occur at
the correct time. The timers fire erratically either one hour early or one hour
late. This is a problem with the detection of the time zone (GMT or BST). It
can be solved by downloading the updated DLL and copying it to your
WINDOWS\SYSTEM32 directory.
Stop the Home Automation Service from the services dialogue (Control
Panel/Administrative Tools/Services/Home Automation)
Download the updated LifetimeUtils.dll
and save it to your WINDOWS\SYSTEM32 directory.