Just another bug report =P
I don't know if this is significant but here it goes...

After doing a search for "asakura ryoko" in the character field, I bookmarked image 29866.

No problems so far... then, in the same page, I try to bookmark image 26093.

No problems again... or so I thought... I looked at the first image, then I see that it isn't bookmarked at all... so I check 'My Favorites' and it tells me that I haven't bookmarked any favorites at all.

I've tried it several times both in the search pages, and in the normal view, and I've also discounted the possibility that the page, "This user has not marked any images as favorites" page could be cached.

Well, I tested both images and I was able to successfully add them to my favorites and them remove them again. I did change the way the 'add to favorites' action works a while back.
What browser are you using?
And what exactly happens when you click the add link?
And has anyone else that might be reading this experienced the same problem?

nevermind -_-

I was using it wrong. Gomen for raising a false alarm. I confused the bookmark with the favorites.

Oh, ok ^^