thanks for your reply.
I looked into some of the cases were the editor did not load the texts. There is no "loose" "|".
It seems the "|" to construct a table is ok ?! When I write the contents of a tablerow next to each other, like this: "| cell 1 || cell 2 || cell 3", is that different for the editor to load, than writing the tablerows underneath each other?
Besides that I actually found which elements causes the editor not to load:
1. I use the extension Extension:Tabber and if I put all my contents directly inside the tabs, the editor will not load, it doesn't matter how much self written text is in the tab. But if I put another page (as an include) in the tabber, the editor will load.
What the editor does when its actually loading the tabbers, it puts everything inside the "<tabber>" tags in the "wikimagic" function
2. when I divide a page in columns via wiki markup and I than try to edit just a section of the page containing a part of that markup the editor will also not load. when I load the entiere Page its fine. I guess this is due to what you assumed with the "|" character and the editor doesn't recognise this as a part of the page deviding.
Another wierd thing happens by using the wiki markup "<nowiki>" and "#" inside it. That creats very interesting result in the editor. I solved that by using "<source>" instead. I guess that will be solved with your upcoming update?
I tried to install the current development of the update 5, but somehow its not working at all. I will wait till its fully released.