owyn: Same here! Did some digging and noticed something that might help. Notice in the "Symbol not found" the WebKit is looking in the dylib for a big honkin' symbol with "_jPKhmttEPFiS0_" near the end. When I opened the libwebrtc.dylib file in TextEdit, I see a very similar big honkin' symbol, but it's missing "tt" near the end. So that part of the symbol reads, "_jPKhmEPFiS0_". Don't know who's to blame, the WebKit or dylib file, but these two parts of Safari appear to identify some "setVideoDecoderCallbacks" code by 2 different names, and that's causing this crash!