Hello everybody, Since I updated to Yosemite, I noticed that, sometimes, several items don't open at login (of course they are selected on preference/users and groups/startup = clumsy french translation). It can work fine 5 or 10 times without any problem and for no noticeable reason some items don't open (always the same, like Twitter for instance). The problem occurs on my MacBook pro retina (mid 2012) and not on my iMac (late 2012). It is not a big deal because I can open them "manually" but Can you help ? What must I do ? Best regards.