Thanks for your quick answer!
That can’t be it, the issue repeat itself on different browsers/computers. I have tried Chrome and IE on my Win7 computer and Safari on my Mac.
The issue is that I can clic and create a dynamic sidebar, but after I add another the first one dissapears. So I remain with only the last created dynamic sidebar, not the whole list as you explained in your walktrough to create the example theme.
So I ask myself, what does prevent the sidebars from being created? I changed already the rights to the theme folder, can there be an issue with the database?
Help needed,
Bastiaan