I have just been working on a C# file (Global.asax.cs) in a web application for the last hour or so, and I have been shown the prompt to "tabify" or whatever about four times. Each time I choose to tabify and save the files, yet at some seemingly random point later on, I get prompted again.
I am using ReSharper, yet this doesn't happen when I code at home, also using ReSharper. Only at work.
Are you using the Productivity Power Tools VS 2010 extension? If so, go to Tools
-> Options
-> and choose Productivity Power Tools
. Here you can turn off the option to Fix Mixed Tabs
. This will turn off this warning.
Power Tools for Visual Studio 2010
Power Tools for Visual Studio 2012