I don’t know – what’s easier for you, downgrading to 2.5.1 or upgrading to an alpha release of bbPress?
Personally, if I needed integration between WordPress and bbPress, I would install the 0.9.0.2 of bbPress and 2.5.1 of WordPress. Alpha software should be used for testing only.
Here’s a question I had not considered before but is important. When you downgrade in WP and bbPress, does the re-install also downgrade the db version number? I hope so, or things will completely break.
How does a downgrade actually work? I didn’t think there was a downgrade function, I figured you just reinstalled the old version from a database and filesystem backup, or installed the old version fresh if you didn’t have any content to worry about anyway.
How are people actually going about the downgrade?