Mail, FaceTime, Messages, ... all crash and preference panes for Internet Accounts and iCloud don't load

Hi,
I'm on a 27 inch iMac (end 2013) 3,5 Ghz i7. I've upgraded to Yosemite and everything worked... until today.
When I try to launch Mail, Messages, FaceTime, Rapidweaver (and who knows what else): they all crash immediately with this message:
Crashed Thread:        0 Dispatch queue: com.apple.main-thread
Exception Type:        EXC_BAD_INSTRUCTION (SIGILL)
Exception Codes:       0x0000000000000001, 0x0000000000000000
I am the administrator of the iMac, there's a second user (account) that isn't affected (there, everything works). I have no idea what is happening since I haven't made significant changes to my iMac. Please help! I'm compleltely stuck here...
Thanks,
Steven

Hi,
... since I haven't made significant changes to my iMac
Tell us about the insignificant one then .
Do these include turning Off any Fonts ?
Adding any Fonts that might cause Conflicts ?
The default Font most apps used to need was Helvetivca.
it was used as the font for most window titles and other text items with the windows.
For Messages we know that since Mavericks this has been AppleGothic.
Use the Font Book app to check both (AppleGothic is well down the list).
They should not have Duplicates, they should be Enabled and should Validate (File Menu).
8:51 pm Friday; November 14, 2014
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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Larry63
Jun 12, 2012 8:54 AM
Subject:
My IPad (1) keeps showing " user name or password incorrect" .I go to settings and all is okay ,I even deleted email account and reentered the info .How do I correct?
iPad
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Mail, FaceTime, Messages, ... all crash and preference panes for Internet Accounts and iCloud don't load

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