OK, with the 3.6 update everything works fine, just one small fix;
change this on line 1330:
public leave_msg(param[])
{
if (get_pcvar_num(joinleave_message) == 1 && get_pcvar_num(leavemessage_enable) == 1)
{
new id = param[0]
if(!is_user_bot(id)) return PLUGIN_HANDLED
to this:
public leave_msg(param[])
{
if (get_pcvar_num(joinleave_message) == 1 && get_pcvar_num(leavemessage_enable) == 1)
{
new id = param[0]
if(is_user_bot(id)) return PLUGIN_HANDLED