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I have upgraded to latest version and have a problem with groups! I had previously set groups as public and allowed anyone to view the group details. But after this upgrade the link changed and added the user name before the group. Hence a 404 is caused.
If you notice in the below example, the link is formed with an additional path for username. I don't see such an issue in your demo.
Menu setup is given below. This worked perfect in Jomsocial 2.8. Why is the user name prefixed before group name? Due to this, a 404 is caused when a guest is browsing the site. As a workaround, I have made the groups to be allowed for registered user only but I need to allow public to view it as it was done before. Please let me know why username is added before group!