Some thoughts...
- they're not already enrolled are they (yes I know, but it happens)?
- that still looks odd to me (the language difference doesn't help).... what theme is that? Try with Boost. This is definitely 'Participants' in the left-hand navigation and then 'Enrol users'?
- Open your web server's Javascript Console and try again. Any (red) errors?
- they're not already enrolled are they (yes I know, but it happens)?
- that still looks odd to me (the language difference doesn't help).... what theme is that? Try with Boost. This is definitely 'Participants' in the left-hand navigation and then 'Enrol users'?
- Open your web server's Javascript Console and try again. Any (red) errors?