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I found something strange flag on my IDE screen, in the editor section. May I ask what is this? Is this a reason of my IDE failure?

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I captured when I testing using same command, but suddenly displays strange characters and prompt also changed.

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After update IDE result was same. After reboot also same

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  • "Oh seok kyun" is my name ^^; Feb 18 '16 at 3:34
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That flag is likely not the reason for the failure. Because the CS50 IDE is web-based, you can be logged in from multiple places and access the same file. This particular indicator means that your cursor is at that location in another window. It's similar to what appears in Google Drive when more than one person is currently in a document. In this case, there is more than one person in (or more than one session accessing) the document.

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  • You were right. It was because of the code problem. Thank you for your quick answer. I finished vigenere program with all green dot ^.....^ Feb 18 '16 at 14:52

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