Rails has been compatibility tested with all built-in, and select 3rd party, RapidWeaver themes. Themes with sticky navigation should not present an issue, Rails has independent offset controls to always keep content accessible. After testing, we’d call Rails “highly compatible” with other themes, with a few key exceptions.
Only one (1) Rails stack layout can be used per Stacks page.
Rail Items should be limited to 8 items or less, to prevent cropping of lower navigational items on narrow height screens.
Rails is not compatible with themes where… main content is inside a fixed positioned container, or with themes that animate the outer main content container. These cases are rare for a theme, but if concerned, you can ask the theme developer.
Rails supports IE9+