This just started on my Win7, but only with 3D mp4 files. No problem for the past six months of editing them, and posting them to YouTube. Then after a MS update, the runaway memory leak in the file began. Plus, no previews while the file is expanding. When process is stopped, and Windows Explorer is moved to a location without 3D mp4 files, all works well.
Any tips on other forums (besides MS) that might discuss this?