I just contacted my VAR and she did some comparisons between registries when the down arrow key is changed.
(I tried it on my machine and got the same result as you did).
This is what she said:
To undo the arrow down keyboard shortcut ONLY...rename this key to tPlate0_old.
OK, so I just got this back from my VAR:
they found SOLIDWORKS
does not have the ability to input manually the missing command. So,
you have been attached to SPR 571841 (Cannot restore rotation commands if
another short-cut is set to use arrows). We will both be notified when it has
Workaround is to change the registry key or reset all customizations to
There you go.