Okay....
I\'ve been running Visual Studio RTM since it\'s release on my work computer. Last Friday I installed/Updated IE to version 9 to test a JavaScript issue. Af
I fixed the issue...
I noticed (when I went back to working in VS2010) that MSDeploy was no longer working. From this thread i re-registered the ieproxy.dll and magically VS2012 seems to open and load my projects now!
I guess something in the upgrade from IE8 to IE9 messed up this registration and caused all sorts of trouble. Running the following at the command line fixed it.
regsvr32 "C:\Program Files (x86)\Internet Explorer\ieproxy.dll"
I removed a "security update" KB2750147 (after an other one, K278... can't remember) and now it's right.