What other plugins are you running?
Add this line to your bb-config.php:
error_reporting( E_ALL & ~E_DEPRECATED );
Is it in your my-plugins folder?
Okay, now that we’re ready to get this show back on the road, let’s get this show back on the road! 
That would be translating bbPress, and you’d need two things: Poedit and The bbPress POT file from your version.
You’d want to make “new from POT”, then save it as de.
Find the things you want to translate and put the translations in for them, then save again, and upload the de.mo to your forum’s my-languages folder. If it doesn’t already have one, make one.
Then, in your bb-config.php, set BB_LANG to de, and you’re done!
You could always use Role Manager and disable “Make new topics” for Members.
Put <?php if ( bb_is_front() ) { ?> before the widget and <?php } ?> after it.
Assuming that $mydata_curpage is the current page number (starting from 1):
bb_paginate_links( array( 'total' => ceil( $mydata_count / $mydata_pagelimit ), 'current' => $mydata_curpage ) )
You’ll have to do the actual pagination yourself, but that’s as simple as an array_slice.
<?php bb_forum_dropdown( array( 'selected' => 2 ) ); ?>
What exactly are you trying to click on?
Akismet and Bozo Users come to mind:
If a post is marked as spam by Akismet or a user is marked as a bozo, they will not show up to normal users. The +1 more means that the 1 post was either marked as spam or deleted without the topic being deleted.
The “(Array voices)” is probably a plugin error. What plugins are you running on your forum?
I don’t understand your logic. BuddyPress is a plugin for WPMU, which is a multi-blog version of WordPress. bbPress is a forum program. Not a plugin for anything, just a standalone forum.
Merging BuddyPress and bbPress would be like merging a car company and a grocery store. You can drive a car to a grocery store and carry groceries in it, but integration is as close as you can get to merging them.
Besides, no other major forum software (phpBB, IPB, VBulletin, SMF, etc) have a social network built in or are a plugin for a blogging program.
I have a copy of it lying around – I’m not sure if I modified it at some point, though. http://www.mediafire.com/?jmyy5ym5em3
Add these to the list:
bbPM
bbPress Moderation Suite
Role Manager
Automated Forum Moderation
http://bit.ly/4LJlfj (a graph of the daily downloads) – 18 downloads this week, 6 of which were from today.
It would benifit the bbPress community as a whole if Matt or MDA (or anyone else with access to the repository) could put up some kind of notice on the Private Messaging plugin page that tells about the security risks.
For me, it’s bb-login.php?action=logout. I think your theme might have the link hardcoded. If so, change the link to <?php bb_logout_link(); ?>.
I’ve submitted this as a ticket on trac: https://trac.bbpress.org/ticket/1209
Because it’s in functions.bb-pluggable.php, you can copy the function into a plugin file and edit it from there. No work needed when upgrading, and it can be turned on and off.
What version of bbPress are you using? 1.0 and up have a fix for this.
error_reporting = E_ALL & ~E_NOTICE & ~E_DEPRECATED should actually remove those errors. Something must be wrong with your server configuration.
Just turn E_DEPRECATED error logging off and you’ll be fine. XAMPP/Windows isn’t the problem, it’s PHP5.3’s new E_DEPRECATED “feature”.
