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This is rather strange.

The Sign-In link (upper right corner) has disappeared from an entire SharePoint web application.

Anyone run into this situation before?

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Has the markup been removed from the master page? – RJ Cuthbertson Jan 15 '13 at 19:32
have you check its not a 64 bit browser. – user994521 Jan 16 '13 at 5:48

This link can be helpful for you.

Step 1:

Go to the welcome.ascx file in 'C:\Program Files\Common Files\microsoft shared\Web Server Extensions\15\TEMPLATE\CONTROLTEMPLATES':

Step 2:

Add the code below to the welcome.ascx file in whichever place you prefer (i.e., in what order you want the link to appear).

" Description="<%$Resources:wss,personalactions_loginasdifferentuserdescription%>" MenuGroupId="100" Sequence="100" UseShortId="true" />

Step 3:

Go to your site and click Refresh, at which point you you will see that Sign in as Different User is now an option

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Please don’t add just a link as answer to a question. If the link breaks, the answer you provided will not be useful for future visitors. Provide an answer of your own and use the link as reference. If needed, you can block quote the content from your link. More information is found in our help center, especially How do I write a good answer – Benny Skogberg Apr 15 '14 at 6:27
Ok. Thanks for the information. – e.ozmen Apr 15 '14 at 6:51
Super! +1 for the answer! :-) – Benny Skogberg Apr 15 '14 at 7:07

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