Hi LL,
You’ll have to upgrade to SecureAccess V3 and by all means also make sure you install the latest update for El Capitan (El Capitan 10.11.1) - it was released only a day or two ago to correct some issues in El Capitan.
In order to upgrade to SecureAccess V3, you’ll have to save your vault. Which is a dilemma, because without logging in you can’t save your vault.
What I did was insert my USB drive into a Windows computer (there should be a file called "SanDisk SecureAccessV2_win.exe on your flash drive which will allow yout to access your vault on Windows). On Windows, log into SecureAccess and save your vault/files to another usb drive or hard drive. By all means do this, since upgrading to SecureAccess V3 means that you have to delete your vault…
Then, on your Mac, download SecureAccess V3 for Mac over here (you’ll find the download links under the header “Download SecureAccess (for Cruzer flash drives)”:
http://kb.sandisk.com/app/answers/detail/a_id/2399/related/1
You can also upgrade your SecureAccess software for Windows, too, but version 2 worked fine on Windows 7 for me.
Once you have downloaded SecureAccess V3 for Mac, follow the instructions over here:
http://kb.sandisk.com/app/answers/detail/a_id/17504
Hope this works for you like it did for me 
