I had the same problem with one redirection. Added, deleted, added, deleted, added, deleted, and … added. The last add worked, the first three didn’t.
Thanks for the update. Unfortunately, it still strips the caption. At least on my installation. I’m using WP 3.3.2 and WP Fluid Images 1.1.2.
I can confirm that WordPress 2.8 Final doesn’t load in Google Chrome (neither Windows or Mac).