The problem was that I had an index.html file in my root directory. Deleting or renaming it solved the problem. Many thanks to Cais!
In my case, there aren’t new albums created either.
Cais,
I did al the steps you described above and after a complete new installation, I get the error again.
Kind regards,
Sven
Cais,
The reset tool didn’t seem to solve the problem. Should I delete and reinstal the NextGen Gallery?
Kind regards,
Sven