Safari system lockup
Yesterday Safari locked up so badly that it could not be killed normally using the usual cmd-option-escape method, or Activity Monitor: Safari also disappeared from the application switcher list and neither Logout nor Restart would work. Seems like this might be related to a change of using separate processes for browser windows; someone did not do their homework on making this work properly when Safari has a problem and needs to be killed.
I finally had to use 'ps -ef' in Terminal to find the process ID and then 'sudo kill -9 <pid>' to kill Safari. Not exactly what most users would find palatable, but the only alternative was a hard power cycling of the entire computer (e.g. pull the plug).
I’ve never experienced such a severe hang problem in OS X 10.8 Mountain Lion, so I’d say that Apple has some loose screws rattling around in OS X Mavericks.
Blank screen Safari
Safari also goes into “blank window mode”, meaning that no matter how many refreshes, the window stays blank (completely white). Opening a new window with the same URL works fine. Loose screws.
Steve K writes:
I am having the exact same problems with Safari under 10.9 I was trying to create a shipping label using the FedEx website. Forget about it. Safari kept hanging. Went over to Google Chrome, no problem.
MPG: my guess is a multi-threading synchronization bug.
I am having the same problem: the FedEx.com site is unusable with Safari in OS X Mavericks: rainbow beachballs and unresponsive browser.