Yes, this happens when you use "LEFT" click selection (not the default).

the shortcuts you used above need the "emulate 3 button mouse" setting enabled... which you can do with "RIGHT" click selection:

but as soon as yu enable "LEFT" click selection, the setting is unavailable (greyed), and thus those shortcuts doesn't work anymore

I guess you're on Windows, and I suggest you to use a little utility (called X-mouse, or a similar one) I suggested in another answer, here;

Can't navigate in the 3d view

With that, you can have an automatic setup just for Blender mouse usage, and your 3 button mouse will use the middle button as it is intended by Blender, so you don't need the "emulate 3 button mouse" setting, and thus you don't need the shortcuts either...

hth

Yes, this happens when you use "LEFT" click selection (not the default).

the shortcuts you used above need the "emulate 3 button mouse" setting enabled... which you can do with "RIGHT" click selection:

but as soon as yu enable "LEFT" click selection, the setting is unavailable (greyed), and thus those shortcuts doesn't work anymore

I guess you're on Windows, and I suggest you to use a little utility (called X-mouse, or a similar one) I suggested in another answer, here;

Can't navigate in the 3d view

With that, you can have an automatic setup just for Blender mouse usage, and your 3 button mouse will use the middle button as it is intended by Blender, so you don't need the "emulate 3 button mouse" setting, and thus you don't need the shortcuts either...

hth