This is your third post on this in the last 45 minutes.
The answer doesn’t change. CS6 is not supported under El Capitan and it will never be updated to make it fully compatible.
Your choices are to live with this, roll back and earlier operating system or move to Creative Cloud.
Sorry to burst your bubble there Bob, but I spoke to Adobe support on the phone last week as we have both InDesign CC 2015 and InDesign CS6 and I was told that if they release updates for ID CC 2015 that are relevant to CS6 they will push it out for CS6 as well. I've seen updates to it every now and then, though very rarely.
Why else would Adobe's bug reporting tool still be up and accepting bug reports for CS6, and why should I NOT be posting things about it in case other users around find fixes that they discover by themselves that will work for me as well and the rest of the community?
Obviously we know CS6 isn't officially supported on El Capitan, but when I asked on the phone, the engineer said that updates will still be released if they become available and are created, it's just that there is no more live support from Adobe for CS6.
I really don't appreciate your negativity on this, and, as you are not Adobe staff, I won't lend much credence to what you say.
Thank you for posting though.
I too have had exactly the same problem since upgrading to El Capitan. Fingers crossed, deleting IDCS6 preferences has solved it with no text disappearing today - hoorah. Restart ID while holding down cmd-alt-ctrl-shift. See this post for details: Adobe CC InDesign disappearing text when editing! Please Help!
Glad it helped, but be prepared to need this again. I would back up your prefs so you can restore them quickly.
Thank you - this seems to have worked for me as well and now I can get rid of my old tower and work from the new iMac - you are allowing me to unclutter my desk! I was hanging on to the cinema display and tower only for the use of InDesign in 10.7.5.