Gallery Changes - Folder Titles
Folder titles of your galleries used to be wrapped by a h2-tag. This was changed to h1 now.
As I don't code that much anymore I have no idea since when the chances took place, I can't say which skins are affected by this or not (date wise).
If you experience any issues with the titles of older gallery skins, check for the h2 tag in the css code and fix it by yourself. Additionally you could notify the creator of that skin.
Gallery Changes - White Lines
After a bit of investigation I found the reason for those white lines. I can't say why they appear on some deviations and for other they don't though. If you happen to have UserStyles installed (in my case it was deviantTHUMBS:Huge by rotane) you might not see them, but if you disable that they will appear as well.
To fix that use
.tt-fh.tt-boxed .tt-bb {background: none;} in your gallery CSS code.
If you see someone else struggling with those white lines, link them to this journal or tell them about the extra code.