> Guess you havn't had a hanging Safari or Chrome tab take down the entire OS. According to the contents of my ~/Library/Application Support/CrashReporter logs

> Guess you havn't had a hanging Safari or Chrome tab take down the entire OS. According to the contents of my ~/Library/Application Support/CrashReporter logs my last Safari crash was August 3rd 2014 which IIRC would have been a 10.10 DP release. I don't doubt you are having this problem but it's hard for me to relate considering my freshest CrashReporter log for any app is VLC from November 3rd 2014. In my experience using 10.10 on 3 different Macs (Mac Pro 4,1, MacMini late 2012, rMBP early 2013) the worst issue I've encountered is somehow when using multiple displays and setting SilverLight video to fullscreen my Dock occasionally gets set to auto-hide. Pretty sure that's some ugly hack being done by the SilverLight plugin since it has never happened with Flash or HTML5 full screen video. My gut feeling is these different experiences might be due to migrating data between OSX releases. I had migrated/upgraded from 10.4 to 10.8 and finally did a fresh install / setup for Mavericks which was then upgraded/migrated to 10.10 DPs. Looking at an older backup from November I see some files ~/Library/Application Support/ renamed as .incompatible. so I wonder if perhaps the 10.10 DPs were doing something unique to dump old app data? It just seems odd to me that some of us are having little to no issues while others are reporting these major issues. It could of course also be machine specific (driver) causes but at least for the last 2-3 generations of machines there isn't really enough variation in hardware to justify that theory.