@trevelyan

The first one doesn't work for me for some reason. For example, I have "KTV Wednesday Jay Chow - Seven Mile Fragrance" on my studied list and if I remove the checkbox for KTV Wednesday and click "update my subscriptions", the entry is still there. Is this what you mean?

The the second method is the only way I could remove lessons from my studied list.

I've tested this problem on another machine (my work comp, totally different IP) and the problem is still there, although it's running Windows 64-bit and Chrome 20.0.1132.57 as well.

I suspect it's not a browser/OS issue but an account/database issue...?