I use R3251 for a while and it goes along with my GTX 690.
Today, i wanted to test newer revisions of clover but unfortunately with R3526 and R3424, graphics drivers are loaded but black screen on desktop. Switch back to R3251, all is fine. Any idea? I wasn't there for a long time.
If so, the problem is that even my Ethernet kext doesn't load anymore (same for DummyUSBxxx.kext so no mouse/keyboard either) . I'm really stuck right now and even rebuilding the cache from a Yosemite system does not work .