I upgraded to OS 10.11.4 (Capitan) and am working on a book.
None of the chapters will open without crashing InDesign CS6 with the following errors:
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x00000000020201fe
Exception Note: EXC_CORPSE_NOTIFY
And worse all my back ups copies do the same crash.
I tried deleting the book manager and that didn't make any difference.
This book represents a couple years of work.
Asking for help to recover the chapter files.
In my life this is a May DAY request.
I'm on a MacBookPro.
Moved to main InDesign forum.
You really should have visited here BEFORE you moved to 10.11. CS6 is not supported under it and most users are reporting problems.
You have three choices:
1. Upgrade to Creative Cloud
2. Roll back your operating system
3. Live with it.