Well this is not a bug but a strange feature. With 13.0, FC raised the min. org rank of ppl that can invite others to join from level 2 to level 4. We, for example, are a 'republic'. Therer are 4 lvls.

SO only the very highest level can invite others? This could be the philosophy of some orgs, but not ours! So we had to promote everyone to highest rank, which is not that logical!

The previous way - invting ppl from lvl 2 - seems much better!

Or is there a way around?