I had the same problem and brainstormed 4 a month, re-installing the software on the stick but in that case the password wasn’t excepted with the excisting vault. More efforts I will spare you sind you probably wanna know what worked (for me)
Well.
In the folder on the stick “SanDiskSecureAccess Settings” there is a file called “lock”.
The highttech solution is to rename the file 2 something else and voila…everything worked.
My vault had 2 be repaired but there seemes to be an integrated repairtool which did his/her work excellent.
Hope it will work 4 you as well.
succes
btw. letme know if it did.