This more just annoying than anything and I'm not sure if it's easily fixable.
When posts are being quoted, the different color for the quoted portion of the post is darker, which is good because it shows depth and makes a clear distinction between the poster and the post he's referencing.
It makes it much more difficult to see when the quote ends and when the new post begins.
Would be great if you guys managed to fix this, but it's not forum breaking. Nice update by the way