IntelliSense doubles first letter of keywords

I have a very annoying problem with IntelliSense in C#. Visual Studio 2012.

When I type a key word at the beginning of a line, IntelliSense doubles the first letter. For instance, private becomes pprivate, enum becomes eenum.

I do not have that problem in VB.

Anybody has a fix?
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Jacques Bourgeois (James Burger)PresidentAsked:
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käµfm³d 👽Commented:
I have never witnessed this in VS 2012. Can you describe the exact process you take that when you begin to type? Any chance you can get a video of the behavior? That's an odd one indeed.
Jacques Bourgeois (James Burger)PresidentAuthor Commented:
I simply start typing a line, and when I hit the space key after the first keyword, IntelliSense replaces it with a new word that has the first character repeated, so void becomes vvoid.

This happens only at the class level. I do not have the problem inside of methods.

This also happens only after a few minutes of working in the editor. Closing and reopening Visual Studio solves the problem, but it eventually reappears after a few minutes.

I fear I will have to completely uninstall and reinstall VS, something I would rather not lose time on.

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gt2847cSr. Security ConsultantCommented:
Do you have any plugins for VS that you are using that might be causing issues?  Tools like ReSharper, Code Rush, and others interact with Intellisense and could potentially cause interactions...
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Jacques Bourgeois (James Burger)PresidentAuthor Commented:
No. I have stopped using add-ins years ago because they always end up causing problems of that type.
gt2847cSr. Security ConsultantCommented:
Has this happened from the very beginning with C# or did it start recently?

If it started after the fact, what (if any) patches were applied during the time frame it began?

What Extensions do you have loaded/installed?

Are you up to date on the VS2012 updates?  (3 is current, 4 is in RC2 I believe)...
Jacques Bourgeois (James Burger)PresidentAuthor Commented:
It started recently, and the only patch that might have been added in that time is Update 3.

The only installed extensions are basic ones provided through Microsoft:

     Microsoft Web Developer Tools
     NuGet Package Manager
     Visual Studio Extensions for Windows Library for JavaScript

And they are not used in a standard Windows Application, which is what I am working on right now.
gt2847cSr. Security ConsultantCommented:
You might try uninstalling update 3 and see if the problem goes away.  To find it in Programs and Features, you have to find it under View Installed Updates as it was implemented as a Windows Update...
Jacques Bourgeois (James Burger)PresidentAuthor Commented:
I finally went to uninstall and reinstall Visual Studio 2012.

When doing so, I saw that some old extensions, such as Visual Studio Tools for Applications, where left after uninstalling VS 2010. I uninstalled those, and it solved the problems in VS 2012.
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