Power Manager 3.5.0 has a demonstration expiry bug. In some situations a schedule can continue to operate even after the demonstration period has passed. Any scheduled events left in place can not be modified.
This bug does not affect licenced users of Power Manager.
Fix Being Tested, Shipping in March
We have a fix for this bug in test and will ship an update in early March.
Solving the Bug Now
Situation Causing the Expiry Bug
The bug appears if the Mac is off when the demonstration period expires.
Thanks to Matthew Holmes for reporting this bug.
Update: This bug is fixed in Power Manager 3.6.