Sorry for my late answer.
notification area, tray corner at bottom right looked messed-up(overlapped)
after a quick test, i don't see what do you mean, can you be more precise please?
but if you don't mind, I want it(Ob_Numix*) back :0
Sorry, i don't keep old theme to avoids large iso/package size. If you want the old theme, just unsquash the previous release then copy the theme from ~/.themes or /usr/share/themes to your new installation. Make the same things for tint (~/.config/tint2/) if you want to change it too.
Please keep in mind that severals important changes can be apply between two ISO release. So, using an old ISO can cause trouble.