Logged In: YES 
user_id=6405

That does look correct. I'm not sure why apache can't write to the 
message file. Have you restarted apache since the group changes? Or 
perhaps a reboot would be needed (though I doubt it)? 
 
In the midst of all that, I missed a couple of other points: 
1. the indexes are used for full-text searching, 
2. it's intended that MySQL (and the other RDBMSes) implement their 
own full-text searching in the next (0.7) release.