Opening a new file only shows a tab when the file has been modified

Dan Higham 12 years ago updated 12 years ago 2
Only just started happening but every time I open a file no tab appears until I modify the file. http://vimeo.com/35984182
Are you double or single clicking?
Single, but it always used to work for single click. Works fine for double, is single supposed to behave like that?