Hi thanks for the response. No I wasn't doing that, but it seems the editor does remember which individual items/sub-items are enabled/disabled.
For example if you disable the condition, then disable the entire event (from the far left margin) then re-enable the event, you still have to re-enable the condition (or something like that). I would've thought disabling the event would encompass the condition and action(s) and so override it.
Which is kind of good... but I think it can get confused sometimes. Or then again it could be me that's getting confused