works as descibred and better – be aware of other, broken plugins though

Replies: 0

First I cursed because the generated XML was broken. A few minutes of google showed me that its because of how WordPress generates sites, other Plugins or the theme can add empty lines. This can break the output.

Manually check the XML and if there is indeed a line, first disable all other plugins and switch to a default theme, then systematically switch back until you found the evildoer.

Then either find and eliminate the empty line in their respective source or curse about them and choose between the two plugins/themes.