JPG was able to login here by switching over to his verizon hotspot ( new IP )
I was trying to get him to isolate different cases.
Switching hotspot also 'fixed' login on his forum as well..
2c
Have you tried the obvious? He could marked as a spammer, and might want to visit this page to get his address corrected.
http://stopforumspam.com/removalOK, the obvious seems to have been the problem. Not sure why I am able to log in to forums running 7.5.8 and couldn't log in to 7.6, but this new IP I have is listed at stopforumspam. I requested removal.