I also have little problem when adding plugin little too fast.
When added files to /plugins/ folder
Then wp-admin area add correct paths:
/home/yourdomain/public_html/forum/config.php
and
https://yourdomain.at/forum/ucp.php
Then I “Activate phpBB bridge” Yes.
And it doesnt work.
After that I deleted “wp-phpbb-bridge” folder from FTP and at phpMyAdmin I change entry′s: wp_options
1) wpbb_config_path:
/home/yourdomain/public_html/forum/config.php
to
/home/yourdomain/public_html/phpBB/config.php
2)wpbb_ucp_path
https://yourdomain.at/forum/ucp.php
to
https://yourdomain.at/phpBB/ucp.php
And after that uploading “wp-phpbb-bridge” to plugins folder, and login to wp-admin, and set again correct path′s and NOT “Activate phpBB bridge”.
Add users and then it works.