Many people are finding such problems with CS6 in El Capitan. There will be no updates for CS6, it's reached its end-of-life.
You should either roll back to the earlier operating system, or upgrade to Creative Clud.
There have been numerous reports of this and other issues.
CS6 has reached EOL and will not be updated. Your best bet is to roll back to an earlier operating system.
That's what I suspected. Thanks