I think you probably have the viewport set to ‘render only’. Open the properties region of the 3d view by pressing ‘n’ while your mouse is in the 3d view. Find the display panel and deselect the ‘only render’ toggle button. (see image)
Sorry for the frustration. Somehow you must have saved that as the startup file. If you ever run a mysterious problem like that again try loading the factory settings from the file menu to reset everything to normal.
I did find though, earlier today, the File/Factory Settings route which got me back to the default page.
But now I can’t seem to find a File menu on any of the headers - only View/Select/Add/Object - so I’m stuck again!
I have to say, this is a really challenging piece of software to get around in!
All I really want to do, at the moment, is find a way to hand write some directions onto a video I have made.
I’ve been trying to follow a tutorial (Envatotuts) called ‘How to Scribble over a video in Blender’ by Karan Shah but I think some important stages have been left out - so I haven’t gotten any further.
“But now I can’t seem to find a File menu on any of the headers - only View/Select/Add/Object” - this means you’ve managed to close all windows except 3d View.
In the upper right corner should be a triangular striped thingie which does bring out a new window if you pull it by mouse.
Menu [File, Render, Window, Help] belongs to the Info window; you can change types of windows using first icon on the left on window’s status bar - look for the blue circle with white ‘i’ on it.
Reinstalling wont help because you still have saved preferences which are used by a new installation - check where Blender’s user preferences are kept on your OS, delete these files and Blender will return to the initial state.
Is this only Blender’s window? Isn’t there one covered by one called by Menu -View - Duplicate Area into New Window? Ctrl - Up or Down arrows do not help either?
Alt-F10 as a last resort?
What does it look like if you open Blender application by itself? If it’s normal view: Menus, 3dview, Cube, then Ctrl-Alt-U should bring User Preferences window. In File tab uncheck Load UI, close User Prefs and try opening your project file. This will load data but leave UI as it is by default.
In case if you haven’t found how-to yet - example.
Note that you can get a lot more if you add another Scene strip where you animate overlays. Use Render -> Shading - Transparent instead of default Sky.