one accounts toon can't recognize or be recognized by the other accounts?

[succulent]

make sure all 3 toons are on the same server

I actually did this not long ago -- made a new 5-box druid team, 2 on hyjal, 3 on silver hand. Took me a few minutes to figure out why three of the toons couldn't be invited to group.

Doh!

In my defense, I'd been fiddling with which server to roll on, checking latency etc, and gotten a little turned around.