The update resets your graphics settings. Re-apply your previous settings. Additionally, delete the cache folder in Documents/BeamNG.drive/ to clear old shader data.
Perhaps most importantly for the longevity of the game, v0.29 began the process of moving away from older legacy code. This optimization improved game stability and paved the way for future updates involving Lua scripting and multiplayer synchronization. beamng drive v 0.29 download