When i open Illustrator cc, i am not able to see any of the dialog selections except 'X' button. The whole window is gray as the sceenshot.
However i can open any older file and edit it. Also suddenly have appeared decimals in stoke and font size as the screenshot and it doesn't accept any number change.
My pc has 24Gb ram and intel i5-3350p. I never had this problem before. I also uninstalled and re installed the setup of creative cloud app. I have the latest version installed.
Try to uninstall and reinstall Illustrator.
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In many other posts that mentioned this, uninstalling Avast anti virus solved the problem.
Thank you for your solution. That works. Uninstalling Avast solved the problems. I will try to re install the antivirus.