Can't move in the 3D view with mouse I thought that I was able to use my mouse to navigate in the viewport before. I can only seem to rotate the project view via the numpad keys. I have tried to Google for my problem but can not seem to find any answers.
You can try one of the following


View > View selected or . on Numpad
If that doesn't work try Shift + C


It seem that with some blend files "zooming to much" locks the 3D view and you can only rotate the view, not pan or zoom in or out, with other .blend files it is OK... don't know the real source or how to fix the file, anyway if you still want "free zoom, pan and rotate", you can copy the objects that you need to a new .blend.