have you tried copying the save directory from your old pj64 1.4 folder to the new pj64 1.6 folder
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pc configuration:
cpu: AMD Athlon 64 X2 6000+ 3.0GHz, GPU: GeForce 8800GTS 640MB, MoBo: Asus M2N32-SLI Deluxe, RAM: Corsair 6GB, case: Cooler Master Centurion 534, HDs: Seagate 500GB + 750GB +external 1TB, Os: Archlinux & Windows 7. my website