Major bug please help asap


hello, when yosemite beta came out, downloaded onto late 2013 macbook pro. have had no problems till now. after updating last update, when try , heavy on mac, closes apps , logs me out. means can't download anything, can't download new yosemite update mac app store.. mac has become useless! need urgently computer thing have school , cost much! thank you!!
 

anyone please!!!!
 


Forums Macs macOS OS X Yosemite (10.10)


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