To reproduce:
Fabric -> Arrays -> Add Storage Devices -> Add a storage device that is managed by an SMI-S provider -> choose any of the protocols -> Neither port, SSL-Box nor Next button is usable
-> uninstall KB2840642, no reboot required
-> Wizard is usable again
Affected Systems:
Windows 7 (de-de), fully patched
Windows Server 2012 (en-us), fully patched