Hi hillquest,
Just to clarify how this process works, if you wish to literally change all events in a series you should edit the first instance and then apply the change to all. As an example, let’s say our event recurs on the following dates:
* December 5
* December 10
* December 15
* December 20
If you edit the December 20 event and apply to all only that event will be affected. If you edit the December 15 event and apply to all then both it and the December 20 event will be effected (because applying the change to all really means, apply to this and all future instances).
So, to change the whole series means you would need in my example to edit the December 5 instance first of all.
Does that help/clarify things at all?