Not sure if this applies only to the Linux client, but I don't have a Windoze one, therefore reporting here:
When trying to right click on an avatar which is appearing at the outer rim of the viewing field, i.e. just so at the edge or in a corner of the screen, it fails to bring up the menu. Instead, a friendship offer is sent immediately! I've made a few casual friends this way (lol), but it's also caused irritations already.
Apologies if this has been reported before, couldn't find it in the known issues.