I am unable to edit any files in a project in Visual Studio 2013. It only happens in one project. If I open a different project I am able to type fine, but once I go back
Simply delete your all temp file from temp folder.
Note: Before delete temp file close visual studio.
To delete temp files:
Run window image
Now you will see your all temp file. Just press Ctrl+A to select all files in the temp folder. Now delete all of them. some files will not be deleted. Just skip them.
Now Open Your visual studio and try to edit syntax. I hope it will work now!