It might be too late to reply, but here’s the solution. The only 003 driver which works with Cubase of any version is 8.0.4(beta). And it’s working as it should be on my system.(Windows 10 64bit / Cubase Pro 10.5 / Digi003 Rack)
http://secure.digidesign.com/services/avid/kb/downloads.cfm?digiArticleId=40492&localeCode=en
Uninstall any other version before install this. Please note that this one is made for Windows 7, and is NOT supported officially on Windows 10. So if you try to install this, too many warning message will be popped up, just ignore them and “install it anyway.”
Hope this helps.