What about the Wang Yu bug in Mac OS X Yosemite? Mac OS X Yosemite new bugs, so users can play pranks again, but beware of friends! As long as you enter a specific string, the various text boxes on your Mac will crash to the end, and even some apps can only remove the reload.
It is important to note that this text appears in the edit box only to cause a crash, and there is no problem with simply displaying it. And according to feedback, not every device will have problems, the specific reasons are unclear.
In order to protect the world peace, Little Lok the original text of the bug as a screenshot, lest you spread cancer everywhere like small.
As for the solution, the more relaxed one is to use CLEANMYMAC or similar software, using the "Reset App" function, you can restore the damaged application to normal, but all the data of the software will be lost, please be careful.
As for the manual method, you can try to delete all the files under ~/library/container (~ represents the app name), but all the data will still be emptied.
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