After last night's update to 184.108.40.206 I can no longer remove a trigger to one of my rules. When I click on select trigger events I get java.lang.IllegalArgumentException: Command 'size' is not supported by device 15. on line 1914. Device 15 is Alden Howard's Ambient Weather API and the triggers are any changes to the custom attributes for outside temperature and inside temperature. All I need to do is remove the trigger for the inside temperature and I can't.
Quick fix may be to just add a size command to the driver that does nothing (2 line change).
You have a corrupted rule. Your only way forward is to remove that rule, and create it over. This could happen due to database corruption. It most likely has nothing to do with the update.