I have similar problem. When a user invite someone to his group the other user don’t receive any notification. I think this is a bug. I’ve also tried default theme, but still it doesn’t work. 🙁
I’ve tried the default theme without translation on my development site, here: http://devel.escrivere.com
No way, notifications doesn’t work. 🙁
I’ve also another problem (but is less important, than the ones above).
Users can’t edit their own forum posts, also if I’ve setup editing time to 15 minutes.
