Jettison 1.7.2 is now available, and contains a single fix to correct an intermittent licensing problem that a few users have experienced. On some machines, Jettison would accept and confirm a serial number, but would subsequently fail to save it in its preference file. This resulted in a very frustrating cycle for new users: You’d buy a license for Jettison, enter your serial number, then later get pestered to buy Jettison again.
If you haven’t been bitten by this bug, there’s no hurry to install this update – it’s functionally identical to version 1.7.1 except for the licensing fix.