Script tasks not pre-compiling all of a sudden

I've been building and running script tasks for years without issue. Then all of sudden last week Visual Studio starts showing the "Task is configured to pre-compile the script, but binary code is not found" error anytime I open a script -- even I make no changes. If I copy the dtsx package to another machine, the script compiles fine and I can see the binary data in the raw .dtx file -- so I know the code is correct.

I can also reproduce the error simply by adding a new script task, going into "Design Script", make no changes to the default code (which is basically one line: Dts.TaskResult = Dts.Results.Success) and simply press "OK" on the Script Task Editor.

I've been trying to find some VS setting somewhere that might stop the script IDE from producing the binary code, but I can't. It doesn't seem to be project setting, because all my SSIS projects are now suffering this problem on my main dev box.

Anyone experience this?

Did you just recently apply a bunch of Microsoft patches?

Did you see this thread? http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=1855810&SiteID=1