My opinion of SanDisk has totally sunk. I was all for their products until having several bad issues with flash drives and bad customer support experiences.
I had two older 32 GB USB 2.0 flash drives with Secure Access 1.0 and they both started having access issues. It was suggested to upgrade to Secure Access 2.0. I did this only to have them both stop working and my vaults became inaccessible.
So I purchased a new Ultra USB 3.0 32 GB flash drive with Secure Access v2.0 thinking maybe a brand new one setup with v2.0 would work fine. I was severely disappointed. The new one is having the same issue with Secure Access as MSSUSAN mentions. Support has you go through various hoops, none of which solve the problem . It might work briefly but then back to the issues. Now I have a vault on the new drive which is inaccessible. I guess these encryption programs are just too buggy.
I’m going with another brand.