In the last version blender I used (2.69 maybe?) the numpad allowed me to switch between user, ortho / perspective, top, bottom, back, front, left, and right views.
At the moment the only ones that seem to do close to what I expect are:
- numpad 3 = right ortho
- ctrl + (numpad 1) = back ortho
the rest just seem to (mostly) flip into arbitrary views or rotate the camera in small increments.
Incidentally I chose the "3DS Max" input settings in user preferences if that's likely to have made it go odd...
Anyone got any ideas?