Here's what's up with the groups:
When we do it the way I do it, what I assume is probably the correct way the client switches from using GroupInvite opcode to GroupInvite2 opcode and GroupFollow opcode to GroupFollow2 opcode. Of course no one ever figured those opcodes out so they're all set to 0x0000.
Here are the titanium opcodes, I don't have the 0.6.2 opcodes yet because I don't have a 0.6.2 client atm.
Code:
OP_GroupFollow2=0x42c9 #this is a 2nd version of follow, that's used with invite version 2 is used
OP_GroupInvite2=0x12d6 #this is a 2nd version of invite
Tested it with 3 people and it worked fine, leader could talk and could invite the 3rd person correctly. Such a simple problem and it only took me 2 days to figure out.