Sliders in Lightroom are white or sliders are blue in Mac OS, and don't look the same as they did in previous versions of Mac OS.
Sliders are blue in Mac OS X 10.10 Yosemite.
The menus are white in Mac OS X 10.9 Mavericks.
Upgrade to the most recent version of Lightroom.
The issue in Mac OS X 10.9 was fixed in Lightroom 5.2.