I've done some checking and have not been able to locate a simple document describing all of the changes from 1.6 to 1.7. Just the same, I would recommend upgrading to the latest possible version for your device. Miscellaneous bug fixes are made as needed in each revision of the software, and there is a good chance that the problem you are having has been addressed in more current versions of the software. To find out which driver is appropriate for your hardware, check out the following website:
GPIB Installation/Configuration TroubleshooterLogan S.