Can we try to keep the discussions about this topic in the following thread?
@Plerry: You have to differentiate between the path length of the plaintext file in the BoxCryptor Drive and the path length of the encrypted file in the BoxCryptor Folder.
A plaintext file could have a path length of just 20 characters, but the encrypted file could have a path length of 270 characters if the path of the BoxCryptor Folder is already 250 characters long.
As others are experiencing the problem even when trying to save files in the root of the BoxCryptor Drive, I think the reason for the problem is something else.
If you disable filename encryption, Google Drive will sync the changes to all computers. Enabling/disabling of filename encryption basically bulk renames all files in the BoxCryptor Folder.
@MartinAB: Please see my reply in the other thread.