this thread may be quite old, but the described issue is still existing.
I'm using the latest vesions of BoxCryptor (2.37.1057) and KeePass (2.43).
When I use the synchronization feature of KeePass with a database that is encrypted with BoxCryptor, I always get the following error message:
The process cannot access the file, because another process has locked a part of that file. `
After that the file in the BoxCryptor folder is broken (file size is 0 byte).
If I don't use a BoxCryptor encrypted file as synchronization target or if I directly save the file to the BoxCryptor folder (no synchronization), everything works fine. I also tried to deactivate transactions for file saving in KeePass. But that doen't help.
Are there any news on this issue? It seems that BoxCryptor has a problem with multiple read/write operations in a very short time.