The file not being released is the previous SQBs
Yes, with hyperbac stopped, all file handles are released...but:
Stopping HyperBac to force it to release old SQB files is not a solution, because when I stop hyperBac( stop sql server, stop hyperbac, start hyperbac, start sql) it frequently doesn't recover the database, or marks them suspect, as I previously stated.
Also, needing to restart hyperbac/ the entire server isn't a good solution.
I'd really like to know why hyperbac won't give up it's handles, and how to fix that.