Backward compatible from CC to CS6

Question

To save backward compatible doesn't work in CC. I can't open the file in CS6. Why?

Answer 1

Berna,
It sounds as if we are looking at some strange malfunction.
This is a general list of things you may try when something goes rather wrong; in your case, 1), 2), and 5), would seem less likely; if you like your settings, you may prefer 4) to 3):
It seems that something is seriously wrong.  You may try the following (you may have tried/done some of them already) and see whether it helps (the following is a general list of things you may try when it is not in a specific file; 3) and 4) are specifically aimed at possibly corrupt preferences):
1) Close down Illy and open again;
2) Restart the computer;
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder with Illy closed (more tedious but also more thorough and reversible);
5) Look through and try out the relevant among the Other options (Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy);
Even more seriously, you may:
6) Uninstall, run the Cleaner Tool, and reinstall.
http://www.adobe.com/support/contact/cscleanertool.html