Adobe Illustrator CC 18.1.1 doesn't open files with "cmd O"

Question

Mac Pro (begin 2009), 2 x 2,26 GHz Quad-Core Intel Xeon, 12 GB 1066 MHz DDR3 ECC, NVIDIA GeForce GT 120 512 MB - OS X Yosemite 10.10.1
After having updated A.Illustrator CC to latest version I'm not able to open files by using "cmd O" and it's impossible to update linked files.
Please note that A.Illustrator CC has been updated also on my Mac Pro Book and works perfectly.
Could you please let me know where is the issue?

Answer 1

Fettone,
You may try the list; you may consider going straight to 6).
The following is a general list of things you may try when the issue is not in a specific file (you may have tried/done some of them already); 1) and 2) are the easy ones for temporary strangenesses, and 3) and 4) are specifically aimed at possibly corrupt preferences); 5) is a list in itself, and 6) is the last resort.
If possible/applicable, you should save current artwork first, of course.
1) Close down Illy and open again;
2) Restart the computer (you may do that up to at least 5 times);
3) Close down Illy and press Ctrl+Alt+Shift/Cmd+Option+Shift during startup (easy but irreversible);
4) Move the folder (follow the link with that name) with Illy closed (more tedious but also more thorough and reversible);
5) Look through and try out the relevant among the Other options (follow the link with that name, Item 7) is a list of usual suspects among other applications that may disturb and confuse Illy, Item 15) applies to CC, CS6, and maybe CS5);
Even more seriously, you may:
6) Uninstall, run the Cleaner Tool (if you have CS3/CS4/CS5/CS6/CC), and reinstall.
http://www.adobe.com/support/contact/cscleanertool.html