I can confirm that creating a plugin as mentioned above did in fact fix the problems I was having
I am having this same exact issue. Running WP 3.0.1 and bbpress 1.0.2. Have tried the fix mentioned in this thread, however it did not work.
EDIT: Upon further research I found this plugin to work:
https://bbpress.org/forums/topic/apostrophe-and-or-quotation-marks-cause-backslash-to-appear
I know this is way old but it helped me tons and I wanted to thank you neil!
I just applied the fix listed above (here: http://bestservedcold.com/news/bbpress-and-wordpress-magic-quotes/comment-page-1 ) on line 632 of wp-settings.php hash out $_POST = add_magic_quotes($_POST ); and it works on all new posts. I am wondering though if this will cause issues with any of the other plugins or the way wordpress itself functions.
Same here and here is no apparent answer to be found …
Same issue here as well 
I’ve read through the forums with regards to a magic quotes issue, but he fixes listed are old and code has changed since they were posted. Any help from the devs would be super!
