Hi @martin, thanks so much for sharing this information.
I was further developing my pages today to cover more Elements on the next pages with the same parameters. As I moved forward with higher (and of course unused) parameter ID’s I never had any issue. I was about to share this experience with you within the next minutes but you were quicker. 
I just got back to page 1 and tried the parameter ID’s that didn’t work yesterday and now they work because I deleted the previously kind of “left over” controls on the next pages. So I can confirm that it works now at least after just two tests but I am sure that was the reason. Apologies for that but I wasn’t aware of this and by far not able to get to this solution. I was thinking of a kind of cache that maybe stores used parameter ID’s and wasn’t cleared after I thought I deleted all controls with the same ID’s. But during my issues I just focussed on my page 1 and forgot about the others on the next pages.
During my intensive work today I always stumbled over the fact that not all default values were being set correctly after updating the layout to E1 as mentioned in the other post here…
https://forum.electra.one/t/default-values-not-being-sent-from-editor
I wonder if there is a workaround i.e. to place one control button on the E1 page that calls up all default values on this particular page.
Since you mentioned today the differences in the display hardware on different unit series I also wonder if the touch sensitivity of the display has been changed with one of the recent firmware updates. Since I needed to double tap a lot today to check my work I have the feeling that it is harder to set the defaults using a double tap than it was before. Is that possible?