Oh, thank you for answering here, I found my mystake - I have an url issue with the name. OK, if you use a not exiting username, you will get all groups back: .../community/groups/member/xxxx view reply
Thank you all, I restarted the upgrade from 1.5 to 1.8 on a LINUX machine.
As I noticed, on my first try on a windows machine, the directories where created, but the files where missing.
My try on a LINUX machine worked.
But both times a had an... view reply