CS6 is unsupported under El Capitan.
Lots of problems reported here and there will be no updates to fix them.
Either upgrade to Creative Cloud or roll back to an earlier operating system.
What a pity,
I expected for this update for a long time now.
Do you know please how to roll back to an earlier operating system?
Not without a backup, no. You’d need to wipe the harddrive and start all over.
Oh this is too hard