BuddyPress.org

Okay. Issue resolved. This time I deleted everything and activated buddypress and selected the default theme. No additionals plugins at all. And it works okay. All the group/forums capabilities work as expected.
Now, I’m going to install one pluging at a time and re-check if functionality remains the same, till I find out which of the plugins is causing the malfunctioning.
I had installed several plugins including: tweetstream, facestream, SEO for buddypress, bp like, bp friends, etc, etc. One of those is crashing the group/forums feature in buddypress.

I’ll let you know which one is causing it after I finish testing.

Regards.

Martin