I am facing the same problem with Database Toolkit. I have followed your suggestion "Replace "Provider=Microsoft.ACE.OLEDB.12.0" with "Provider=Microsoft.Jet.OLEDB.4.0" in the connection string". Still I am facing the same problem. In my case my database is stored in the network.
I tried to debug the code. The problem is with "DB Tools Close Connection" vi. which causes the LabVIEW to crash.
Do you have any solution for network based data access.
My backend tables database file was an .MDB file (for Access pre-2007), stored on a network share that was mapped to a drive letter, so it is on our network. Can you go into more detail on what you're working with?