I am running Mma Home Edition, on Mac OS X Version 10.10.5 (MacBook Air).
I restarted my system and now "?" does not work! Here is some sample output:
?Log (I entered this, and got the following errors)
Log System` CreateUUID["Info-"] False False False
It had worked perfectly for years, until I had to restart the system (for reasons unrelated to Mma).
Any thoughts Thank you.