[blasterspike]

Hi Robin,
thank you for your reply.
I have tried with

function tinymce_remove_root_block_tag( $init ) {
    $init['forced_root_block'] = false; 
    return $init;
}
add_filter( 'tiny_mce_before_init', 'tinymce_remove_root_block_tag' );

function bbp_enable_visual_editor( $args = array() ) {
    $args['tinymce'] = true;
    $args['quicktags'] = false;
    return $args;
}
add_filter( 'bbp_before_get_the_content_parse_args', 'bbp_enable_visual_editor' );

or with

function tinymce_remove_root_block_tag( $init ) {
    $init['forced_root_block'] = false; 
    return $init;
}
add_filter( 'tiny_mce_before_init', 'tinymce_remove_root_block_tag' );

function bbp_enable_visual_editor( $args = array() ) {
    $args['tinymce'] = true;
    $args['quicktags'] = false;
    $args['forced_root_block'] = false;
    return $args;
}
add_filter( 'bbp_before_get_the_content_parse_args', 'bbp_enable_visual_editor' );

but I’m still getting a new paragraph for each new line.

[blasterspike]

Unfortunately I haven’t found a solution.
I still think that due to

Existing passwords are converted during the import so users can login to WordPress/bbPress as soon as the import and recounts have finished.

the converter should have saved the database information to read phpbb_users somewhere but it hasn’t, that’s way I’m getting the “Error establishing a database connection”.
Which I think is somehow related to
https://bbpress.trac.wordpress.org/ticket/1886

At this point I will ask my users to reset their password.
During my tests, I have also discovered that even if you reset your password, you are still getting the “Error establishing a database connection” error for migrated user and to “skip” it, you have to rename/delete the table “wp_bbp_converter_translator”.

[blasterspike]

I have tried again from a dump of a phpBB 3.1.9 and I’m back at the

Error establishing a database connection

error. Every time I have to do a test, I’m sure I use the “Reset Forums” function (tools.php?page=bbp-reset) and at the import I select both
“Start a fresh conversion from the beginning”
“Purge all information from a previously attempted import”

[blasterspike]

I have to update this thread.
After the Nth time that I was uninstalling/installing bbPress 2.6 beta 2 to do a test with a new import, this time it’s just giving me a wrong password error while I’m 100% sure of the password as I have done a copy/paste from the old phpBB forum.