If you notice that after recently updating your OptimizePress you see the navigation bar items are stacked vertically instead of arranged in a row – this is most likely because of a small change we did in the navigation code which affects sites which are using custom CSS to center their navigation.
To fix this you just need to update your custom CSS to
body .container .navigation ul { text-align: center; }
body .container .navigation ul li { float: none; display: inline-block; }
.page-header .navigation ul li { display: inline-block; }
If you have any further issues please contact our helpdesk team