you do have deleted the old content then right? or is everything double now :)

Right.

1 export entries table
2 save it for backup
3 edit paths. Paths were absolute, not relative which I don't quite understand since I run another blog with the same version of serendipity which uses relative ...

Or, perhaps the easiest, export the full entries table with a sql admin tool (and static pages if required) and then do a search and replace with your favourite text editor/command line tool then delete the table contents and input the data back in.

-Rob A>

This is what worked for me. 5 Minutes ...

I can't tell if it really is a bug, but it sure makes my life as a blog administrator harder:

I closed the domain that I used for installation of a blog. Now I use a different Domain which points to the same webspace. I changed paths in order to fit to the new home of the blog. Text and everything ...