Previous version (6.5.1.1) allowed forum keyword to use an underscore. i.e. name_board. 6.5.2 does not like it and results in "access denied" error message.

Not sure if this is really a bug, just reporting what I found.

I used this query (use at your own peril, make backups first) to fix it.

update w3t_Posts set B_Board = 'nameboard' where B_Board = 'name_board';

And used phpmyadmin to fix board keyword.

It is a bug, and the the solution has been posted somewhere in this forum.

Thanks..

This one is fixed in 6.5.3