I used the force install Storable to install the module. I haven't figured out the copy-on-write test failure.

However, the error that led me down this path--Autoloader not finding dclone.al--was solved by moving use Storable qw(dclone); to the top of my use list instead of the bottom. I have no idea why this worked, but I've moved past this topic for now.

Thanks for the suggestions and replies.